Kicked out?

I just saw a player get tossed from a game 'for violating the rules.' Questions:
A) what rules can be violated? I would have the thought the architecture of the game is the architecture of the game.
B) how would that person then be kicked? Or even detected?
Thanks for any info.
A) what rules can be violated? I would have the thought the architecture of the game is the architecture of the game.
B) how would that person then be kicked? Or even detected?
Thanks for any info.