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

with my experience, I agree with you that 99% of all airdrop are shitcoin, its value can not increase or it can not attract investors.
I do not understand why are they still organize airdrop even though their projects have no potential for the future?