I participated in 5 airdrops and there are some airdrops that I did not participate or ask for but they arrived in my wallet, none of them have value and some of them are meant to spam your wallet or scam people into thinking that they will have value in the future and so worth investing be careful on this kind of aidrops.
I see airdrops as a way to attract people to gather members for social media groups, whether it's Telegram, Twitter, Facebook or others. few of those airdrops actually distribute free tokens, every day we can see that new airdrops appear and even then it is not necessarily a real airdrop. except those who have a sales project and then they do a free token airdrop. but there's very little we can expect from an airdrops.