It should really be something that doesn't need said, but as long as I've been at this I know that users(especially those that don't care) have to have everything spelled out for them. Cheaters are still going to cheat no matter what rule is in place, but managers have protected themselves from the drama if the rule is added.
I disagree, there are many members saying when two or more accounts joining in the same campaign is fine as long as there's no rule about multiple accounts usage. Because this forum doesn't have a rule about multiple accounts usage in signature campaign, but it's the rule of the campaign manager. That's why I always search multiple accounts connections when the campaign have a rule about multiple accounts, if not my work become useless.
Someone can easily take advantage of that, join using multiple accounts, and argue out that they didn't see any rule prohibiting them from enrolling multiple accounts.
Perhaps you could do some update on the campaign thread OPS.
It would be interesting to see if there's an user leave the campaign after Royse777 announce this rule

Who are these users? So far I have seen 1 who shares your opinion. I'm not saying there are only 2 of you who feel this way, but I think it kinda depends on the user. Those that run multiple accounts on this forum probably agree with you, those that live in underdeveloped areas of the world will likely agree with you, but those who operate a single account, or those who are decent managers will likely disagree with your opinion.
Regardless, I imagine you will now see that rule become implemented in some campaigns so that users such as you cannot make the claim of there is no such rule.