I get you but it's really not necessary. In case of (somewhat) realist art you can still recognize AI artifacts, but abstract art is already unrecognizable (and this is the precise reason they want AI art to be marked, so they won't embarrass themselves with peans over something churned out by computer in few seconds), not to mention there is also art created by animals, and it is considered art but it's not created with intent, except maybe the intent of people dipping dog's paw in paint. Thus we again just get to the distinction that art needs to be created just by living things? It's meaningless.
Anyway, i guess next few years will make this even more muddled and the art scene will get transformed permanently. Hell recently i've encountered some AI power metal music which is basically completely indistinguishable from normal, but in this case it mostly serve to show how uninspired and generic entire genre is.