To play fair we need some rules to the game. You can’t punch in a face during the basketball game and once someone starts doing it all the time then most would stop playing at that point and go play another game.
Crypto has rules too, does it not? They're just algorithmic, which some believe is far worse, but others believe is best.
Yes there are some rules. But for the majority of people if someone takes advantage of you, with algorithm or socially, then there is no way to punish them. You have to be careful. You can solve this by educating people to be cognizant of risks but who will do that? Where is the incentive?
If you are big enough in any game the rules are different. Think of Etherium DAO when it got hacked they decided not to play in the original network and fork it and play a different game.