Literally you won't get tagged until you are cheating same campaigns with multiple accounts.
What's the source of this information before you mislead someone into doing this and end up getting all account red tagged. From what I read theymos only meant for opinions that users don't want associated with their main account. Participating in different campaign with alt account isn't that abuse of the system since you're taking advantage of alt account and can possible lead to spamming the forum just to meet up posts counts?