A lot of it is also sudden adoption of new web publishing platforms as well.

For example, recently Framer has been a popular platform used by startups to build their websites so now suddenly you see a lot of lookalike/feelalike websites. They must have a deal with funded startups or something, they are popular among funded startups because they are expensive.

So you must be seeing a lot of websites developed using a certain platform ui that you dislike. I wouldn't be surprised if Framer is actually what you hate. Funny thing is now I have started recognizing framer sites easily.