Airdrops aren't always waste of time, it depends on how good you are with them, the easiest way if detecting a good Airdrops is to watch the rating on top Airdrops platforms like airdropalert or airdropbob, if it's rated 5 starts it's probably because it's listed on coinmarketcap and it's trading
The presence of a coin in the coinmarketcap rating does not mean that it is good. Here it is important that it is in the TOP 100, and not in last place. But if you have certain skills for working with airdrops, you should continue to participate in them.
we saw a lot of coins list on coinmarketcap and after 2/3 month we see no sign of them .because there were scam.important thing about air drop should be 0 risk.and 0 spending fee amount.then personally i join them.