In this forum they have ways of going about it. It is important to have a reputable manager for campaign before you join, thats my fear sometimes for newbies handling campaign, they can easily back out after the campaign. More also you should be sure you didn't break the rule or claimed the reward late. I also hope you are not the only victim
I am not only the victim, almost all participants are victims
Bounty managers should be able to protect bounty particpants with various strategies like not letting the team to add rules like "we can change/edit/modify terms&conditions whenever we want/need". 50% of scam cases on bounty campaigns are result of bad management in my opinion. If team refuses to pay bounty participants then why you don't open scam accusation against team and project..