The same can be said for enforcing intellectual property rights, and we do enforce IP in western countries despite other countries not respecting those rights. We could end up where models can only be legally trained with public domain IP, enforced by regulation, royalties, private causes of action, etc.
You may like things the way they are, but it's false that "nothing" can be done to change it.
Ah yes, the Nirvana Falacy. [0]
Microsoft, Google, etc are corporations that operate within a legal framework. You can quite readily claw back some of their profits from such ill-gotten gains and redistribute them to the creators who they currently intend to put out of work.
"Oh, but some pirate will do it! Oh, but China will do it! So why not let those poor megacorporations do it, too!"
So what. The megaorporations who nominally answer to and respect the rule of law are the lion's share of this problem. They can be made to stop. Solve them and you're 90% there, don't get bogged down in the other 10%.
Art has been democratized. It's not going back in the bottle. A kid with a laptop anywhere on the planet will be able to compete with the largest Hollywood studio in the near future.