When you choose to be bounty hunters you also need to pay attention to the updates of the project that you are promoting if you see irregularities do not hesitate to leave the project and if you choose to continue it will be your own responsibility get nothing.
As a bounty hunter it is their responsibility to keep tabs on the bounty they are taking part in. The reason this does not get followed properly is that one bounty hunter may take part in hundreds of bounties at the same time. Because of this none single bounty gets their full attention. Mindlessly they spam social media and the forum hoping to get paid millions. Though things have reduced nowadays a lot in the forum.
But yes, this increases the problems. They dont check when a bounty gets cancelled or stopped - keep on spamming it and then complain they never got paid. Lack of sensible skills, I would say but its a lot more to that.