Copyrights is mostly used by big companies to fuck with the competition so they can keep a strangle hold on the consumers.
It's a deeply flawed system not in any way to our advantage. Actually having copyright laws strengthened so they apply to AI training would instantly kill the open source scene and make certain only a handful of companies can afford to put out models.
Copyleft is built as a protection against big companies and how unfair the playing field is because of copyright laws. It's like saying crime is a good thing because without it, we wouldn't have a police force.