If someone can't post due to proxy ban, they can reach few members in this forum to get whitelist or just pay the evil fee/buy copper membership to get rid from it.
Although this forum has a rule about ban evasion which mean you must not create alt account to post except for ban appeal, but the reality someone create alt account and not care about it. They can still use their alt account until someone discover it and they're still active, not get banned, one of the example is naim027.
do not use your alt accounts to cheat campaigns.
Cheating in the same campaign wouldn't make you get banned, you're only get negative feedback as the punishment.