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.
Short answer: No!
Like anything in life, its a risk... but you can mitigate your risk by researching and understanding who you are backing and what you are backing. Not every project is equal, what is equal is their ability to give away free tokens/coins.
Projects like Privcy have a great community backing it and is currently in week 6 of a 20 week airdrop. Great coin with huge potential.
Many ICO/Aidrops are a minefield but it sounds like all you have to lose is your time. Spend your time wisely and have a look at Privcy, you wont regret it.