I'm surprised that all these accounts were active solely to participate in the campaign.
Each of them
could have alt accounts, perhaps even participating in the same campaign. But they'd hardly be the first accounts to wake up for sake of participating in a new campaign.
We hope the eXch team will adjust the campaign rules to limit participation in the campaign to active forum accounts that have received at least 10 merit within 120 days. That would be a good measure to prevent any fraud.
Agreed. Given their lack of rules concerning alt accounts, they probably just aren't very familiar with the lengths that people will go to in order to earn a little bit of extra BTC.