Can you list down a few examples of that happening actively ? Please link me to a bounty program where a bounty manager is asking for email id's on the forum and not (outside forum such as google spreadsheets)
I've seen it, but can't find it back in my post history. After notifying the (new) manager, he did take down the email addresses.
There is an issue with bounty managers, they are just exposing participants email ids. In my opinion, it is not a right thing at all, it's just unacceptable.
Although I wouldn't like being treated this way by any campaign manager, I don't think this is a Meta-problem: people volunteer to hand over data in exchange for a bounty, just like they publish their Twitter and Facebook accounts.
I have no doubt most of them use fake accounts anyway, only created to hunt bounties.