This concern should be directed to BountyDetective itself, so you could get their own views too and for amendment to be made, because it not proper. Letting them know the dangers attached to it will be of utmost importance.
If they are not told, the mistake will continue to repeat itself until participants who expose their sensitive emails begin to fall victim.
So, OP, or anyone can pas it across to the for correction.
He/they uses this forum for managing bounties so if there are concerns relating to it I think it's just good to know his/their opinions about the matter, and besides the thread has already been created. This isn't professional and they should not continue the practice.