IDK about that, have you ever been handcuffed and arrested by an armed uniformed police officer because you didn’t spend $3? Lots of people in NYC have. The transit system in Berlin sounds similar to the one we have where I live (not NYC). Here you can get a fine (a couple hundred dollars iirc) and kicked off the train, but that’s it. Not pleasant, certainly enough to keep me honest, but a damn sight better than having a police record and maybe getting shot by a cop.