My opinion is that airdrop - no longer represent value as a type of earnings. If someone likes to participate in Airdrop, then this means that this person is very lazy. He does not like to work. Such people never earn much compared to those who create something new or at least participate in bounty.
And suddenly the market will grow, capitalization will increase significantly, then the coins of even weak projects will cost good money. Therefore, to collect a bunch of different coins with airdrop is a good idea.
Doing airdrops and holding it does have some profit in it. Even getting money from faucets work if there is holding involved.