Would it even actually help to go down that road though? IMO the expected outcome would simply be that AI training stalls for a bit while "unencumbered" training material is being collected/built up and you achieve basically nothing in the end, except creating a big ongoing logistical/administrative hassle to keep lawyers/bureaucrats fed.

I think the redistribution effect (towards training material providers) from such an scenario would be marginal at best, especially long-term, and event that might be over-optimistic.

I also dislike that stance because it seems obviously inconsistent to me-- if humans are allowed to train on copyrighted material without their output being generally affected, why not machines?