I don't see a problem with it training on all materials, fuck copyright. I see the problem in it infringing on everyone's copyright and then being proprietary, monetized bullshit.
If it trains on an open dataset, it must be completely and fully open. Everything else is peak capitalism.
You will never ever in any case be able to stop technology from progressing. Instead of fearing the loss of jobs, how about making sure that we can properly handle and integrate AI into our society with everyone benefitting from it?
Stop the defeatist attitude, get politically active and help kick conservatives and fascists into the ditch where they belong.