Good point, transparency from Facebook, Google or Apple is very low and they can’t be forced to reveal anything, unless someone goes to court, and even then, it would take years to find out anything. AI training has gone out of hand, good thing is that we are maybe beyond the hype point, and the world will see that current AI is not as great as it was made out to be.

Nothing, and we really don’t know how any of these companies use the data they collect. Problem is, you can’t ban everything, or you will get no traffic though search or via social networks.