Yeah I've also agree to you their are a lots of bounty campaign that keeps promising but in the end way they want will happen... But there a lots of honest bounty campaign also...  But we cat ignore the facts that sometimes its happen....  Instead of making it as a problem treat it as an additional experience to you...  I've honestly think that before but for me it not a very huge problem...  But if you want to surely know if the bounty you've join is good conduct a research and also get some information about it.... If you find ot good take a risk...  But make sure this is a honest bounty campaign....