I've been seeing a drop in PRs against my repositories. I have a couple of repositories with around a hundred stars. Nothing spectacular but they were getting occasional PRs until last year. This year I've had almost none so far. My theory is that LLMs prefer sticking to mainstream projects. And since lots of developers are now leaning heavily on LLMs, they are biased to ignoring most of what I provide.

And you indeed get a lot of wheel reinvention by LLMs because that is now cheap to do. So rather than using some obscure thing on Github (like my stuff), it's easier to just generate what you need. I've noticed this with my own choices in dependencies as well. I tend to just go with what the LLM suggests unless I have a very good reason not to.