Base on the image of bounty campaign that most of the participants are complaining about the bounty campaigns are scam it only indicates that most of the participants had a bad experience joining bounty campaigns whether they not got paid or even they did not get what they deserve I think it is much better rather than not being paid. But still it is up to you if you want to join bounty but be prepared on what it may come.
2018-2019 isn't the year for bounty anymore. People should start looking for a better way to spend their times.
With those people that haven't paid with their bounty, still they are trying out their luck.
I've been a victim of a scam bounty that told us to pay in btc but they didn't.