>> I'm sure all the artists and creators they stole from had stipulations too.

> Anthropic paid one billion in a copyright settlement.

Because a judge determined Anthropic was engaged in piracy.

> That's a lot of money considering they never distributed the pirated books they trained on.

This is "fruit of the poisonous tree" as it were. Distributing content derived from pirated content ("pirated books they trained on") is why Anthropic had to pay what they paid.

> Nowadays they buy copies of books, train on them, and then destroy them.

There is a case one could make that this practice could be seen as unauthorized redistribution of a derivative work intended to deprive copyright holders of legitimate revenue.