It wasn't just the meta tags that were abused. People were adding text into invisible elements, or text as the same color as the background, etc. This was the precursor to SEO and ads really, and just people trying to get listed higher in search.

As soon as it can be gamed, it will be gamed. It's just the scammy nature of it all. Now that it's "AI" generated content, it will get to enshitified almost immediately on any system that is created