For me, the number of participants in a bounty campaign is  not the  basis to determined if it is legit. Other people said that it is better to join in a bounty campaign that has less participants because it has high payment. However, there's other people said that it is better to join in a bounty campaign that has great participants because it shows that this campaign is legit. If I were to choose , I prefer to join in a small participants but it defends on the admin if they are responsible for the payment distribution or active in their participants.