One of them was bitscreener, they had this small rule which was unrealistic and they cut the bounty 4 times then advertised for all participants.
Well, actually there were so many project bounties during this summer who changed their bounty several times and giving special conditions that can´t be reached.
But well, you gotta learn from your mistakes
On the other side, i also have seen bounties that didn´t even pay out the desired sums and got destroyed by their recently started community. My Grandfather always said, don´t play with fire or it will burn you
i recently won a bounty on a "smaller project" since there were not many participants. I hope my 100k Dinastycoin will pay me a vacation in italy some day
We will see what the future brings, to me , bounties are just a way to gather coins without any mining equipment or investment.