I participated bounty United Traders long ago. They paid part in BTC, part in UT tokens. BTC they paid every week and tokens after ICO. This was a great scheme.
should all existing campaigns have bounty payment schemes like that. whether payment uses usdt or btc and eth, I think that is a payment that has value. unfortunately, many of the campaigns pay coins ico who do not necessarily have value on the market. therefore most bounty hunters also feel that they are not paid.