Both have.

Zuckerberg runs Facebook which is one of the big big American ads-and-political-manipulation companies. Companies like Facebook, Reddit etc. actively shape conversations using diverse tools.

Musk is less obviously terrible-- he has a firm which makes electric cars, which is obviously excellent, but he also hypes things in a way that goes a little bit further than is quite reasonable-- whether he's treated Eberhard etc. correctly, that can be debated, but he does seem to have a bit of an anti-worker streak and seems to favour a very productive work culture which unfortunately, if it were made common, would be completely unacceptable-- you'd turn into Japan, and if it continues to be successful and grows, then it will destroy the US workers whose existence currently make it possible-- they'd be like the Dodo.

People can't allowed to choose to work 80 hours a week and spend minimal time with their children, partners or parents, or to be tired during the time they spend with those people.

I think he might also oppose unionization?