In case you are not aware yet, there is a trust flag system in this forum that you (bounty hunters) can use against these bounty campaigns for violations of contract. Check the quoted text below for reference.
Use-cases 2 and 3 will be handled by a new system of flags. You can create a flag using a link on a person's trust page.
A newbie-warning flag is active if there are more people supporting such a flag than opposing it. It shows a banner on topics started by the flagged user for guests and for users with less than 7 days of login time. For all users, a "#" is shown next to their trust scores.
For contractual violations only, a scammer flag can be created. This is the only thing which causes the "Warning: trade with extreme caution" warning to return. It also triggers a banner similar to the newbie-warning banner which is visible to all users. A scammer flag requires 3 more supporting users than opposing users to become active.
A new scammer flag should be created for each separate alleged incident. In the spirit of forgiveness/redemption, scammer flags expire 3 years after the incident if the contract was casual/implied, and 10 years after the incident if the contract was written. These expiration times might be administratively changed in specific cases.
Creating or supporting a scammer flag is actively affirming a set of pretty clear fact-statements. If someone knowingly supports a flag containing incorrect fact-statements, then that is crystal-clear abuse, and I will seek to have such people removed from DT ASAP. People who are habitually wrong, even not knowingly, should also be removed.
Only users in your trust network count as supporting or opposing flags. For guests, the default trust network is used.
I am not a lawyer but I think changing rules at the end of the campaign like suddenly requiring KYC before you can get your reward is an example of contract violations.
If you want to know how it looks like, check this
flag created for TerraGreen If in the future you see campaigns violating contracts, you can use the example above. Please be sure to provide the proper evidence.