When you open the client you automatically agree to the terms on the graalonline.com website. While you may think that only applies to PC version, it does not. It's blanketed to all versions of Graal. Now in these terms listed on the website, staff receive the right to enforce their own rules. Read it.
http://www.graalonline.com/docs/agreement
"Any GraalOnline administrator and LINUX Cyberjoueurs reserves the right to determine, in its sole discretion, what constitutes generally accepted standards of online behavior and may, without notice and at any time, suspend or terminate your access to the Graal Online System"