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?
You want source?
One of the global moderator
hilariousandco wearing signature for stake.com and his alt account
hilariousetc is in the Chimixer campaign,so he is participating in two different campaigns because it is allowed.
Theymos never mentioned about multiple accounts in signature campaigns but if you go through rules of every campaign you can find that
No alt accounts allowed. If you've been found out of enrolling with an alt you'll be removed without payment.
which is untrustworthy behaviour and DT members will tag you for that.
So it means you can participate on different campaigns with your two different accounts.