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The usual answer to this is 'don't join/stay in guilds with leaders like that'.
Unfortunately for most players, a designer usually has to design towards the macroscopic view of the game, so any given person individually being screwed over by a bad actor, is solved by 'having that person just try to bounce back from it'.
This is simply because people who DON'T plan to use tools like Master Looter in a bad way, need the option.
tl;dr that's a social problem that the player must solve themselves
because
it is someone using 'a feature that is meant as a QoL buff to the social contract, being abused by someone who disrespects such 'social contract'.