You do know that if it weren't for the bounty managers (the trusted ones), it wouldn't be safe to participate in it? There are many cases in which the bounty providers control it, and then when bounty hunters have done the tasks, they skip on you and never pay you with what you have done.

Anyway, it will depend on the bounty manager on what he will do with his signature space. Some will be paying for a higher amount for the fees managing their campaigns with signature space, but mostly, it's not in their intention. If they can afford to pay it, I don't think they should be locked into one because he is handling it.

For sure, they would background check the company, etc, if it's reputable or not. They wouldn't directly be advertising it for sure.