I think we can not control or select participants who are interested in joining bounty campaign. because bounty organizers expect the project to be followed by as many people as possible, and the more who knows the program,,, then they hope his ICO will succeed. We can only choose which bounty generates enough tokens for us. That's my opinion,,, hopefully not let you down.
But the main problem here is,so many people that cheating at campaign.they using multi account to join 1 campaign.
It's not fair for people that only use 1 account for join campaign.
That why campaign manager should be more selective when accepting participant.