I don't join bounty airdrops, that is why I don't know this one, but regarding about your concern, it is just an airdrop, which is free if you follow their rules to receive it (don't requires any amount of money), if you don't receive it, then try another airdrops, there are plenty of them in the bounty section, crying about it because it is a "Scam" makes you look so desperate about airdrops, even it is not totally a scam.