Not just greed, they want to silence copyright holders whose works they freely use and at the same time prevent others from using theirs. It is like having different set of rules for them. I don't believe training itself is ruining anything, it is the proposed model of value capture and marginalizing content creators that poses greater threat.
Yes, you've condensed the problem in display quite well here. It's not even just hypocrisy, but also short sighted behaviour.
Artists will learn to not trust the web, if they haven't already. The greatest time to train a model was yesterday, eventually no novel ideas, expressions, art will prosper on the "open" web. Just a regurgitation of some statistical idea of words, and pixels.
