Airdrops were worth* a try when cryptocurrencies weren't widely known, and they were their way of promoting the project. Nowadays, there are more professional promotion methods, so airdrops are no longer profitable or worth exploring.
* Before 2017
In those years you can depend on airdrops to make some profits and they use to come in handy without several tasks and hassles which are currently associated with today's supposed airdrop projects that than given out to the participants they are instead the ones reaping from the participants.
I think also in 2024, it was NotCoin and Dogs that were the only projects that rewarded their participants massively the others were scamming airdrop projects.