Unless something has change a ban is very unlikely - I used to use it all the time over the course of a year or two.

In any case you could always create a new account under a different email address to play. If you don't get banned in a year, you're probably fine.

Also people usually report if they get banned, and the Devs do what they can to trace it. I vaguely remember that the last time.i looked there was a note of "no reported bans in over a year"