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simple rule of thumb for airdrop and bounty, don't give money. They should be the one giving you money for supporting their project. I have joined several airdrops and bounties and got coins from them. the real challenge is that most of the coins have no value right now and just have to wait for a nice development or a break out the project will do. and when joing ICO bounties and airdrops never give your private key and password.
It's better to earn real tokens, not fake ones as most of these ICO's are scams and they promise in any method to scam people. I joined so many Airdrops, bounties, but only 2 to 3 paid me and they were in less price. I wasted my time by promoting them on Social media sites.I suggest you to discover much, but after all these also they don't pay anything for us.