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

You're right. And there is. Airdrop in order and arrange to distribute what no one needs. This is such an attempt to create shitcoin`s liquidity (usually unsuccessful). As a result, hundreds of different shitkoins are piling up on our wallets.