airdrop can generate money but the results are not much because the task is very simple. so I think the airdrop isn't worth it now.
The profit from it is not large, but if there is good growth, then in the long term one can not earn badly. Nobody knows how the market of crypto currency will behave in the future.
if you can join some good airdrop like str, hydro that will be awesome. but you need lucky to get into this