I'm on the left and I am not an accelerationist. I think the intellectual property theft justification is a bad one for opposing AI and a surprising one to hear from corners of the internet I inhabit. All of my objections would apply equally to an AI trained from permissibly licensed material.
I suspect it is the result of people trying to reconcile disliking something they think isn't capable (or can't admit otherwise) so they have to come up with a capability-independent reason to dislike (climate, IP theft) that doesn’t have to concede that the technology is impressive.