I don't think crypto airdrop becomes less popular. It's just you who can't find a proper airdrop, and ended to be a scam.

I still actively looking and participate in various airdrop. I got 10k++ alone this year from airdrop, and more to come.

Be smart! not all airdrops will pay off your efforts. Try to find some that has good funding and proper backers. That's the key.