Training on copyright content as research is entirely fair use. Just require that fair use defense to hinge on that research being public, i.e. that it's only

Training on copyright content as research is entirely fair use. Just require that fair use defense to hinge on that research being public, i.e. that it's only a defense of open weight models. A tax on AI is stupid because the big players can dodge taxes well and have the ear of power now, so any regulation would favor them. It would only serve to prevent challengers to their dominance.