I'm sorry, maybe I don't read enough about crypto--what is an airdrop coin?
An Airdrop is a free giveaway of premined coins. Which makes me wonder did the term "airdrop" come to life to circumvent the "no giveaways" rule?
The no giveaway rule is specific to this forum. Cryptocurrencies are bigger than this forum.
The term air-drop probably came from the equivalent of banks printing more money and 'air dropping' them into the economy.