Airdrops don't create a large amount of financial income. Also, airdrops often require a lot of personal information. Anyone with little knowledge of internet scams should be very careful. There are many scam experts now and I never participate in airdrop campaigns because of this.
And that is the problem with airdrops, in the past the only thing that you needed to do to get an airdrop was to give your address and you will get your coins, however with the excuse of following regulations the ones behind the airdrops began to ask for the personal information of the people that wanted to get the airdrop, and in some cases they asked for money or even for people to do some work, and when that happened airdrops lost their essence, so it does not surprise me that they are nowhere near as popular as they were in the past.