Actually most of all Airdrops that I've joined in my almost 1 year of participating in airdrops is just full of worthless coins. Yes, if the ico project was legit and successful then be happy and great cause it will have a great rewards or bonuses that you will really appreciate. But not all Airdrops are worth the time because yes you will get the tokens but they are not going to be on exchanges. I have some coins that are literally just their in my wallet for almost a year already and no more updates with the project. Godbless with participating in airdrop, there's nothing wrong in participating in all airdrop that will come, but if you want your wallet to be more in a positive way then better research first the project before participating.