I used participated in the Bounty Platform of bountyhive.  After a few months, the tokens I got from bountyhive were still not tradedable， so i don't like much this platform. Bountyhive is a good platform yet it has disadvantages from the bounties from this forum, bountyhive has not giving any spreadsheet to know what you've been doing in daily task. I have not joined in the other two platforms. sorry.