Some people are saying that Google #6 issue was just a glitch and not a penalty or a filter. And sure, according to Google's current classification, that change was a glitch.
But lots of glitches have commonalities amongst the sites that were hit. Like many of the sites that got hit by that #6 profile were in some ways stale. And perhaps stale was just a symptom of dated SEO strategy.
You can learn from glitches, because many times glitches show you where and how Google is trying to shape the web. Glitches are side effects of algorithms with a targeted intent, but with too many unintended consequences and/or casualties.
Look back a couple years, and at one point in time SEO Book was not ranking for SEO Book while Paypal was not ranking for Paypal. Add on a bit more market feedback from other sites that were hit and it seemed sites were getting filtered out for having their anchor text too well aligned. That glitch was fixed in a few days to a month (depending on how far over the line your site was and how important your brand was) but the underlying idea of whacking sites for having anchor text that was too focused was indeed a direction the algorithms moved.
Look back a few years more to the Florida update. Some people called pieces of it a glitch or thought that the whole thing needed to be undone. Sometimes lowering the keyword proximity of a page title that was not in the search results brought it back to ranking. And yes the update was too aggressive and they had to back off of it. But filtering out unnatural copy was indeed a direction the algorithm moved.
Glitches reveal engineer intent. And they do it early enough that you have time to change your strategy before your site is permanently filtered or banned. When you get to Google's size, market share, and have that much data, glitches usually mean something.
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