They are there for attribution and, depending on the license, preventing people from making money off something that is supposed to be free.

Attribution from an LLMs output is nearly as infeasible as attribution of where I learned the words I'm using to talk to you right now. I mean, AGI is incompatible with that kind of attribution, so saying we have to do it is equivalent to saying "AI not allowed".

It's a valid opinion, but, IMO kind of a wolf-in-sheeps-clothing argument.