Anything will be stolen and enjoyment on the fruits of others' labor. I do not know much about the techniques they steal, I do not appreciate them. And when you find out how you do it best, report it to the owner of the campaign.
This is really unfair, after all your hard works other people will get your reward. Its necessary that you always monitor the spreadsheet of every bounty campaign you are in with so people will not easily cheat on you. A lot of greedy people in this market, even you report them they will still make ways to scam people.