From my own experience I can tell from all the airdrops that I know the top projects were only: Vite, Ontlogy, Dfinity. All others were shitcoins

Of course, do you know the purpose of airdrop? it is to build community to share small amount of coins worth under 10 ICO price not market price. when you earn 10 USD value it is not the value. If the coin in market is only about 1 or 2 USD. Now to send 1 or to USD via eth tokens are very expensive gas, It is not good airdrop. Fake developers like airdrop because the coins are not popular.