Interesting. Can you elaborate on why you feel strongly about this? It's easily removable--I don't think your characterization that it "forces" attribution is correct, it just defaults it.

It's deliberately hostile, in the way that Facebook is to its userbase. I guess Claude doesn't have nearly the grip on their users that Facebook does. Facebook can make it hard to communicate with (via WhatsApp) or stay connected with some of your friends or relatives, while Claude can just make you use the second-best model for cheaper (if Fable is the best).