@lamb I think it depends on how you offer.
I've had people ask for my help sending a job application email to a small indie "studio" (really just two friends) who was not actively hiring and they disregarded all my suggestions and basically said "your game looks kinda cool, but you probably need my help to actually make it good! Please give me money to fix your game 😁"
So... Don't do that.
I don't think there's anything wrong with you reaching out to the project team basically saying something like "Hey, I'm trying to build a resume/portfolio and your project is very aligned with my own aspirations. If you're ever interested in potentially having me on as an internship position, I'd be happy to provide samples of my work. Alternatively, if you know of similar projects which are looking for (your desires position), I would appreciate if you shared them or passed my contact along."