Jr. Member can join and they even could earn same money with Full Member? Account farmer would be drooling over this signature campaign. Member who spend time to find alt. account probably should pay attention to this signature campaign.
I didn't mean to defend the cheaters, but the @OP didn't mention if they prohibit alt accounts usage, so it's in grey area. Someone had caught alt accounts that participated in the same campaign, but there are few users said participating in the same campaign doesn't mean they're cheater and will receive negative feedback because there are no rules they broke, moreover this forum allow alt accounts.