I have never experienced anything like that. Because, i just started become participant bounty campaign, so i cann't give statement about being scammed by bounty.
Don't you think if it would be better if you not posted that on here, do you?
A friend of mine got scammed joining a campaign here and it has been like 2 month now and still got no word from the said campaign. And sad to say we cant do anything about it if they don't give out the reward. What he did is that he just let it go and joined another worthy campaign which paid him after the ICO ended.
Is it bowhealth signature campaign? Or Shopeo campaign? Which one of the campaign your friend have joined?
Bowhealth is so disastrous campaign imagine there allocated bounty before is millions of tokens but when their campaign ends they change the allocation and made it to thousands of tokens and that made there participants came out to outrage since they had been deceived by the devs team itself. You can check out the latest happenings on there thread so that you can get some bad insights there.