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.
It's true as you say. Usually Airdrops are obtained without doing anything.
Suppose an Airdrop from an exchange. If someone ever trades on the exchange, they will get free coins. Example of a UNI Airdrop. If someone has to do a job, it deserves to be called a bounty, giveaway, or something else.
Another example that deserves to be called an Airdrop is on a blockchain exchange, they give XLM to exchange users who have passed KYC.