A great number of this Ann and airdrop are fake project or scam. I don't trust airdrops anymore. It's only a waste of time.
In addition most of these airdrop coins have no value at all in the market and will be just in addition to crap coins then some of these are is just like a phishing sites in which they will ask you to input username and passwords and some are asking for private keys or you might wrongly input your private keys instead of wallet address. I have 2 friends that they wrongly input the private keys in which their coins gone after a few hours.