Are you asking why breaking the rules on a site gets you banned?

A wild guess … promoting violence is against the terms of service.

Because these sites are run by the certain people.

X is literally a propaganda tool of the extreme right, what Twitter has been is dead. The same is mostly true for Reddit, though even if it the people calling the shots for Reddit were truly only interested in profit instead of politics, it’s not profitable to criticize a manchild wannabe-dictator and his cronies.