actually I'm worried about this, should bounty managers limit their participants to pay the fees they receive in accordance with what they do
I agree with you. They have lot of participants joining in a one bounty campaign. And the total token allocation in a one bounty campaign will be share in the whole participants. If they have so many participants in one campaign the tokens allocation will be less because they many people sharing this token allocation. So if the bounty manager will limit the participant. The token allocation for the whole participant will become bigger because it is less in partipants.