From my point of view, if I wanted an AI summary of a project I could generate one myself. An unlabeled AI readme is almost worse than nothing! I've generated AI readmes myself- they can be useful- but they aren't something to show off.

I'll read a badly-formatted readme written by a human with far more interest than a formulaic LLM summary of a project. But it seems like nobody even notices a readme is slop because it has nice Markdown, and my best guess as to why is that people have become habituated to this stuff.