Sometimes the only thing left to an artist who's being abused by a client is to go public. That usually happens after years of correspondence that goes nowhere. It should not be taken lightly. And involving lawyers is not the solution, since invariably they're the ones who come out on top. Contracts are a minor tool that we all should have, but really it only acts as a guide and not a firm enforcement of it's details. So the only powerful tool we have in our meager arsenal is the network we are all a part of. And it usually will get some movement going in the problem once enacted. Don't think that Brad hasn't thought this through and weighed all the options before doing it. At some point we will all be faced with that decision. I know I have a few times now and I didn't have the nerve to do it so I had to eat the loss. But if an artist can step up and take affirmative action like this, we should be applauding it, not deriding it.
As for folks leaving CA or deciding not to go to any workshops coming up because of this; anyone who would do that should probably just leave. This isn't a playground. CA is an important place for those that want to learn and grow. And the forum isn't just by or about specific people. It's a great community of people that keep it going.