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Today I am reported few accounts who's posted weekly report even if the campaign manager did not ask for it from participants. I am waiting to see how it will be solved.
Remember that if the messages you will find are posted in a limited period of time and that if they even have the same form (obviously not required by the bounty manager who only asks for reports via spreadsheet), most probably are bot and they are abusing with also multiaccount.
If you want post here accounts, if you find this pattern or even for DM and I will help you with the hunt.