There is another account I suspect which is changed hand. I will need to check a few of my campaign sheets to find the username but I don't want to do it too because I am only suspecting and I can not give concrete evidences.
If I remember then I accepted and removed the user from my campaigns several time. My impression was that he used to make good posts but in the last few months or a year the account is posting garbage and it feels like he does not have any quality to make good posts too. I was wondering what could be the case? I can relate it now with at least something like account was given to a friend and the friend does not have any idea what to do but to spam for earning money.
Good that you pay much attention to your campaign participants to understand when some certain accounts change hands. I believe managers are in the best position to uncover these things because they review the posts of their participants every week.
A note that the user's post quality is on a steady decline could save the user and enable him reclaim the account.