You should not contribute if you don't find it worth it. There are many reasons to contribute. Maybe it's easier for you if your patch gets upstream instead of maintaining a fork, maybe you want to be part of a community, maybe something else.

I don't know if it's good for your CV. I have done a ton of open source before AI was a thing, and the truth is that nobody cares. I still have the basic coding test in interviews, even if the team interviewing me is actually relying on my open source work in their project.

And AI making it easier to contribute to a project, I think it's even less valuable today. Do it if you want to, that's all!