My attention has been drawn to accounts that are using a single wallet by different accounts when I noticed paraspatel used my POA to register the Bounty detective campaign.
Those who have posted your wallet or POA, you can give them a negative trust or neutral trust. I do not think if anyone copy your poa then any problem will happen to you. Hence they might be banned for the post they are copying. Yet, to stay safe from being marked as alt account you should provide them neutral or negative trust.