I think this is exactly the problem that many artists have with imagine generators. Yes, we could all easily identify if a generated artwork contained popular Disney characters - but that's because it's Disney, owners of some of the most well-known IP in the world. The same isn't true for small artists: There is a real risk that a model reproduces parts of a lesser known copyrighted work and the user doesn't realise it.
I think this is what artists are protesting: Their works have been used as training data and will now be parts of countless generated images, all with no permission and no compensation.
So Disney don’t need to worry about AI art tools - so ‘attacking’ them with such tools does nothing.