I believe that the participants in the bounty have a positive effect on the dissemination of information about the ICO project. But with an unregulated large number of participants, their reward in the companies of bounty social networks is very small. Also, despite the fact that the reward is 1-3% of the total pool of coins, the influence of the bounty participants on the value of the coin of projects after entering the stock exchange cannot be critical.
Of course, the bounty participants have a very positive impact, Bounty participants can support and promote the ICO project. But, I think the number of them should be controlled so they will get appropriate compensation from their work.