If a campaign manager doesn't accept you into a campaign any longer because you distrusted them, they are abusing their power. I would be curious to see if you have evidence of this happening or if this is just a fear you have?
There is a manager who has more priority for users who have custom trust list. This indirectly indicates that "put me in your trust list".
Saying that and showing that are 2 different things. Feel free to show your proof. If true it is sort of walking the line of ethically correct/wrong.