I commented on this in the past, the biggest problem has been this model used, because the reward hunters are participating in something that still has no value and with that has a very uncertain future the correct thing would be that bounty hunters receive bitcoin weekly as payment, this would be the only solution
1. Join a bounty project promoted by reputable bounty managers here. You can try to search a thread here in the forum for them and there are quite few results of them in a list form.
this still doesn't guarantee that everything goes well, these scammers have taken advantage of the fragility of this system