This thought just comes to my mind especially these days, with a lot of altcoins doing airdrops or giving away different altcoins.
But I got some confusion here when the "airdrop" term used.
Because for what I believe the meaning of "airdrop" is a way of giving a free coin/s to some wallet addresses without seeking any investment or doing nothing.
Are those spreading all over around especially in this forum known to be an "airdrop" is considered an airdrop or bounty campaign since some of those are requiring people to fill up some of the forms or need to sign up or follow some social media accounts, etc?
Since you did some task or work to get those coins.
Its always been like this as far as I can remember.
I mean even latest big example of uniswap - they didn't ask anything for it except being a user of their service which is already something (you paid fees).
So I don't think there will be any airdrop that won't require one thing, but your wallet address, company wants to get value for the coins.