In practice, if you get dozens of PRs from people who clearly did it to bolster up their CV, because their professor asked them or something like that, it just takes a toll. It's more effort than writing the same code yourself. Of course I love to mentor people, if I have the capacity. But a good chunk of the GitHub contributions I've worked on were pretty careless, not even tested, that kind of thing. I haven't done the maintainer job in a while, I'm pretty terrified by the idea of what effect the advent of vibe coding had on PR quality.

I feel pretty smug the way I'm talking about "PR quality", but if the volume of PRs that take a lot of effort to review and merge is high enough, it can be pretty daunting. From a maintainer perspective, the best thing to have are thoughtful people that genuinely use and like the software and want to make it better with a few contributions. That is unfortunately, in my experience, not the most common case, especially on GitHub.