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?
No one know, I'm just sharing my feeling.
I mean, you can imagine if you're want to work under someone company, will you being honest with anything during interview? I doubt that, we're taught to sugarcoat or improvising even lying in order to looks good in front of our employers in order be hired.
Regardless the campaign managers get hurt or not if they got distrusted, I don't know, but as the participants, people will try to looks good in front of the managers.