Yeah. I'm sure some (maybe a lot?) are for selfish reasons, but there is also a pretty large section of users who have always wanted to contribute, help out, or make some features in their favorite projects and just never had the skill or opportunity to do so and see LLMs as a way for them to final actualize that desire.

Think about it from the perspective of a non-programmer, or even total non-technical person. Vibe coding to someone like that looks like complete magic. Suddenly to that person, a whole new world has opened up. Ideas, features, bug fixes they've always wanted but could never do now look possible. That particular group of people don't see it as spamming the maintainer, they genuinely feel like they're finally able to help.

So they're not just selfish, but delusional.