This rule should honestly be reconsidered. Jagex is not a perfect entity, there's no customer support. If and when you get falsely banned you are met with a button that says "no appeal" and a screen of evidence that isnt evidence. The recipe for a ban seems to be this:
Play a lot >> Presumably get reported by people when you ignore hundreds of randoms on your alts
get banned
Real money and time wasted.
I challenge you to use cball alts for 1 month without getting banned.