I actually think that free airdrops are very good marketing tools to promote new coins entering the market, it's a way to attract the community to the coin and the project. You can't really get rich with airdrops but at the end of the day is somewhat getting free money with minum effort, and if you can get the referral program and invite some more people into in you can actually get some nice gains. I am always looking for new interesting Airdrops with real projects so you odnt end up wasting time in useless coins.