What if there is absolutely nothing, as you are probably starting to suspect, that can be done, without completely undermining the trust of the community by creating a position of power that could bring down the whole system if they were a bad actor? By making users transactions be possibly "locked" you've literally undermined the entire premise of censorship proof and decentralization and opened an avenue of abuse that would affect anyone, not only the idiots that chance it on these OBVIOUS scams, obvious as they come without any way to audit them or from known/trusted actors and generally make promises that no one can hold them to keep.
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What if instead it went by votes of the community not one single person. There honestly has to be some type of accountability otherwise there is nothing to stop it from happening again and again and yet again.