Joining in bounties is easy but you are not sure if it is worth your hard work, when you joined you take the risk of what will happen in the end, maybe they will not pay or the reward is smaller than what you expected.
So we have to choose a Bounty that we think is good and the prospects for the future, don't just join it, it will make you regret at the end because the Bounty that you follow can be a scam.