I'm sorry, maybe I don't read enough about crypto--what is an airdrop coin?
This means that for the simplest actions you will be given a small amount of coins of some kind of company)))
Companies that run certain campaigns and introduce into the digital world of new currency, in this way (airdrop) promote their "new products" and thus animate users.
This is a marketing good way to promote and campaign.
If the project succeeds, the coins will have market value, and if not, then they are worth nothing.