Why shouldn't you? When you make the choice to play this game you're choosing to abide by the ToU. Just because you "Didn't know" doesn't mean you don't deserve the silence. People who join the game and ask for someone to sext them don't always know the rules, but they are silenced.
I was about to say that royale. By playing the game you automatically agree to the ToU. Just because you didn't read it doesn't mean you don't need to follow it.
Very easily. If you choose an inappropriate username the system will not accept it. So therefore to have that username you need to change the letters a little so you fool it. That's why when you see an inappropriate username it has multiple repeats of the same letter or numbers replacing a letter. Tip: if the system doesn't accept it that's a hint.