Based on the scenario given on the op  ,  that takes a lot of time and you will only get 50 usd at the end ?  wtf  . i think im gonna burst if that happens to me   but 50usd is still a money   . that was better than nothing at all  .

Thats the reason why i dont like joining a bounty because they take too much time to finish and the rewards are not also guaranteed  .  worst thing that can happen is what if you the project will end up on scam  ?