They are connected each other and probably all account controlled by same person. Can you take a look if they abuse on some other campaign? Its seems
Cryptotalk Signature Campaign doesn't have rules about alt account. So basically they didn't broke the campaign rules and forum allow multiple account. I can't tag them if they abuse any campaign at same time where alt account isn't allowed. Anyway, I have sent PM to Yahoo62278, so he is the one who could take appropriate action about that case.
AFAIK, he has been banning even users who are cheating the campaign using alts which to me i think is very commendable because most of the accounts are hacked/sold/farmed.
If you check the list of banned users, you will find cheating accounts in there too.
Cryptotalk just has a few rules but Yahoo is helping to enforce them at the same time also helping to reduce the damage the campaign would bring to the forum and this includes farming or cheating in campaigns using alts.