Recently I saw an article that said that 4/5 ICOs of projects in the year 2018 has failed. Among the 4, many turn out to be scams
Sometimes some of the projects do not pay the boubty or airdrop rewards because it fails to reach its target and the invested amounts are privately shared to the investors.
So you should try to be very selective with the projects you use valuable resources for.
It's disappointing at times when you know that you have so much effort in promoting a project only to end up not being paid and even if you are paid at times, the team would still abandon the project and you end up with a coin that is worthless. Well, that's the life of a bounty hunter because there are times when you will be scammed so we need to take an effort in knowing the campaign we are promoting and as much as possible, know if the funds are escrowed because it's better that way since you know you will be paid later on.