So, if there be any user wearing stake signature and calling that a scam thread that has not be resolved be closed, then that very wrong, allow stake to handle the issue and provide a solution, you are only hired to promoting the service, not hired to defend their wrong doing.
You have perfectly said. To lock any thread by the paid member is not desired hence the participant of the campaign should try to solve the case so that there is not accusation. But if without solving the problem insist on locking the thread then it will not be for the site itself.