https://www.jwz.org/blog/2018/01/the-follower-factory/#comme...
I don't think the internet has changed that much in the last year or so. If that's true, then it must be alg changes or that content creators have figured out how to beat the algs.
I'm guessing it's the algs, since quoting every single word I want to search for is usually the only way to get reasonable results.
I think the reason is that Google rewards following it's instructions for mobile, security, etc, and existing quality content is often kept online merely as a donation to the public. Having the incentives of a spammer and following through on every rumored 2% rank improvement is almost a requirement to get near the top results.
I'd go so far as to say that an optimized page is often an indicia of low quality / unoriginal content.