I don't know if they're shaking people for money, but I have seen plenty of videos of alleged antifas sucker-punching people that they think are fascists. There's videos of them throwing rocks at the police, too. There are stories of them setting fires during protests (before the current ones). There are also stories of violent street fights with neonazi groups. To me, it's just as hilarious and naive to think they are all pacifists.