Imagine buying a website for $25,000. It's earning $800/month consistently. Then Google rolls out a core update three weeks after you complete the purchase. Traffic drops 60%. Your $25,000 asset is now worth maybe $8,000. This happens. Here's how to make sure it doesn't happen to you.
Google algorithm updates are the single biggest risk in the website buying space — and they're the risk most beginners completely ignore. You do due diligence on the revenue, check the backlinks, verify the traffic. But do you check how the site performed through the last six major updates? Most people don't. And that's exactly where the expensive mistakes happen.
This article covers what algorithm updates actually are, which recent updates hit content sites hardest, what to look for when evaluating a site's update history, and how to build a site portfolio that can survive whatever Google throws at it next.
What Actually Is a Google Algorithm Update?
Google's algorithm is the system that decides which websites rank where in search results. It's constantly changing — Google makes thousands of small adjustments every year. Most of these are invisible and barely noticeable. But several times a year, Google rolls out major "core updates" that can dramatically shift rankings across thousands of sites at once.
When a core update hits, sites that Google now considers lower quality can see traffic drops of 30–80% almost overnight. Sites that have been building genuine authority and creating genuinely helpful content often gain traffic at the same time. There are winners and losers in every major update.
The critical thing to understand as a website buyer: the update doesn't change the site itself. It changes how Google perceives and ranks it. A site can look perfectly healthy — good traffic, good content, clean backlinks — and still get wrecked by an update if Google's new signals decide it's not as authoritative or helpful as it thought.
The Updates That Matter Most Right Now
Here are the major updates from the past 18 months that a site for sale in 2025 should have survived cleanly:
Who Gets Hit and Who Gets Stronger
Sites That Get Hit
- Mass AI-generated content with no editorial oversight
- Thin affiliate pages with little original value
- Sites with no clear authorship or expertise signals
- Heavy reliance on one type of informational query
- Content that mirrors what's already ranking without adding anything new
- Sites that ignored mobile or Core Web Vitals
Sites That Get Stronger
- Sites with real authors and demonstrated expertise
- Original research, data, and first-hand experience
- Strong E-E-A-T signals (Experience, Expertise, Authority, Trust)
- Diversified traffic beyond just informational search
- Sites with loyal email lists or direct audiences
- Content that genuinely answers questions better than competitors
What to Check Before Buying Any Site
Here's the exact process to audit a site's update history before spending any money:
- Pull 24 months of traffic data in Google Analytics. Look for any sharp drops that coincide with the update dates listed above. Even a partial recovery is better than no recovery at all.
- Cross-reference with Ahrefs or Semrush organic traffic chart. Compare their third-party estimate with GA. Look for the same drops in the same months. Consistent data across tools is a good sign.
- Ask the seller directly about each major update. "Did your traffic change after March 2024?" A good seller will have a clear answer. A vague answer is a yellow flag.
- Check if the site has real author profiles. Named authors with bios, credentials, and links to other work are a strong E-E-A-T signal that protects against future updates.
- Assess what % of traffic comes from informational queries vs commercial queries. Informational content (how-to articles, general information) is more exposed to AI Overviews. Commercial content (comparisons, reviews, "best X") tends to be more resilient.
- Check for diversified traffic sources. Email newsletter subscribers, social media followers, and YouTube presence all reduce dependency on Google.
- Look at the content quality yourself. Read 10 random articles. Are they genuinely useful and written by someone who knows the topic? Or do they feel generated and generic?
Some sellers list sites immediately after a traffic drop, hoping to exit before buyers notice. Others will claim the site is "recovering" from a Google update. Be very skeptical of recovery claims without 3+ months of upward trending data to back them up. Recovery from a major hit is slow and not guaranteed.
The New Threat: AI Overviews
Beyond traditional algorithm updates, there's a newer and growing risk: Google's AI Overviews (formerly Search Generative Experience). These are the AI-generated answer boxes that now appear at the top of many search results, directly answering the user's question without them needing to click any website.
For purely informational content — "how to do X," "what is Y," "when did Z happen" — AI Overviews are reducing click-through rates dramatically even when a site still ranks well. You can be on page one and still get far less traffic than you used to, simply because Google is answering the question itself.
This makes commercial and transactional content more valuable than ever. Someone searching "best project management software for remote teams" still needs to click through to read comparisons and make a decision. AI can't buy the software for them. But someone searching "what is project management" might get a complete answer from Google without ever visiting a website.
Prioritise buying sites with high commercial intent content — reviews, comparisons, buying guides, and tools. These are significantly more resilient to both algorithm updates and AI Overviews than purely informational content sites.
How to Protect Yourself as a Buyer
You can't predict every future algorithm update. But you can significantly reduce your exposure with a few smart buying decisions:
Only buy sites with a clean update history. A site that has held its traffic through 2024–2025 without major drops has already proven it can survive Google's current standards. That track record is worth paying a premium for.
Diversify your portfolio. Don't put all your money into one site. Three sites across different niches means one update is unlikely to hit all of them simultaneously.
Buy sites with multiple traffic sources. An email list, a YouTube channel, a strong social media presence — these all act as insurance against Google volatility.
Price in the risk appropriately. A site that's never been through a major update cycle is riskier than one that's survived several. That's worth factoring into what you pay. Don't overpay for untested traffic.
Buy Sites That Have Already Survived the Updates
Motion Invest lists sites with verified traffic history across multiple algorithm updates. No guesswork.
The Bottom Line
Google algorithm updates are a permanent feature of the website investing landscape. They're not going away. The question isn't whether your site will face them — it's whether it's built well enough to survive them.
Sites with real expertise, genuine human authorship, diverse traffic, and content that actually serves readers consistently outperform through updates. Sites built on thin content, AI mass-production, and SEO shortcuts get punished harder with every passing update cycle.
Do your update history homework before buying any site. It takes 20 minutes and it can save you tens of thousands of dollars.