The same address used in participating in a campaign already showed the prove and there is nothing to stress much about it, from the evidence provided by some few users he has been in found of using both accounts to participate in a same campaign which all the campaign prohibited that action.
I am also gonna leave my feedback on that account and from my judgement redtag is what those accounts deserves. Nevertheless, from few post I have came across here said having Alt is not prohibited but using them to cheat in a particular campaign is highly prohibited or if one account is ban then the rest are not permitted to operate.