Accounts can receive temporary and permanent bans for violating the Game Rules.

You can see the specific paragraph of the End User Licence Agreement (EULA) that served as a reason for the sanction to be applied in the pop-up menu that appears in the MY.GAMES Launcher upon game launch attempt.

You can find the full text of the EULA and Game Rules, that you accepted upon creating the account, here:
MY.GAMES End User Licence Agreement for Games

Should you require additional information about sanctions, please use this article to submit a ticket from.