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.
I agree it is so much hard to discover a very good and profitable Ico now, you promote them for a long time then you ended up with nothing there should be regulation here so people will not get scammed again and these airdrops are just a waste of time for everybody.