Thanks all of you guys for your help and good advice. I have sent PM to most of the bounty managers and some of the bounty managers have already removed this cheater from their campaign. I think this cheater will stop now after getting negative trust because most of the good bounties do not accept negative trusted account.
he is banned
https://bpip.org/Profile?id=2437185after checking his other alt accounts (according to the quoted post below). two more of his other alt accounts have already been banned except the Buntond account (
Buntond BPIP).