It can be one of participants and it can be anyone else. It can be competition. It can be someone who is tagged by Hhampuz. It can be someone who is kicked from campaign or someone who is not accepted.
I would like to point that it is irrelevant who is making accusation as long as accusation is true and valid, that is all what matters at the end.

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There are some posts somewhere in this forum of some senior members who think that managers should escrow funds to avoid situations like this one, that they share some responsibility and should pay from their pocket, just like some other senior members think that managers should not pay because it is company who should pay and if company doesn't pay managers shouldn't either.

Hypothetically if someone pays me to place advertisement on my car, I would expect them to pay me, if they say they can't pay me because company didn't pay them it is only up to me to say "it is ok, you don't have to pay me" or "I don't care, pay me from your pocket".

I think Hhampuz is great person, manager and everything and this is forum after all, users should not use it as "pay-to-post system", and if I was participant I would say "it is ok, who fucks blender, lets move on"  just like I would say for any other campaign but I also know that someone doesn't share my opinion and they do have right to ask for what they agreed on, as much as they have right to "anonymously complain".