Or this rule?

Three Strikes Policy

As mentioned in the Warning Offenses section, earning three official warnings results in a ban upon the issuing of the third warning. To be clear, it is the third violation that results in a ban, not “three warnings and the next violation is a ban.” Be aware that official warnings do not “expire” after any period of time.

It should also be noted that the three strike policy is not writ in stone – flagrant violations of warning offenses may result in a ban even if they do not result in a third official warning. Repeated violations of the same warning offense, especially over a short period of time, will also likely result in an immediate ban.