That's why I already stopped joining new Airdrops.But in some cases you can make money by joining legit airdrops.And If you can refer some users then you can generate a decent amount from Airdrops.
Legitimate airdrops aren't that many anymore either now, so obviously it's getting harder and harder to find really legit Airdrops now that it's still better to partially ignore them and partially monitor them to see if they're actually legit or not, rather than having to spend a lot of time for Airdrops.