Just to play devil's advocate, if I were on Microsoft's team, I'd say: You just proved our case. Having the "whole fucking internet" == having general knowledge

Just to play devil's advocate, if I were on Microsoft's team, I'd say: You just proved our case. Having the "whole fucking internet" == having general knowledge. Synthesizing general knowledge is fair use. If it was trained only on the works of a certain artist, it would be plagiarism. But if it's trained on all artists, it's not really trained on anyone.