Airdrop is outdated, since 2018 I have not seen a good airdrop campaign that paid good amount for money, 99% of the projects failed to pay and the few that paid are in few dollars, around, 1$ to 10$, this was what I've seen in past airdrops I joined. The best way to earn free tokens from new projects right now is through testnet, today, many new projects are still looking for testers and I have joined many, like Arbitrum, Shardeum, zksync, and a few others, I believe that testnet is worth anybody's time than airdrops.
For now, the airdrop is indeed very difficult to make money. Personally, I haven't been looking for an airdrop for a long time. In fact, even today's airdrop is quite difficult to generate $ 1 or even $ 10 for each project worked on. some people said that among the many airdrops he worked on, only a few paid, and among the results of the payment, almost all of them had no price.
In previous years, there were still quite a lot of people looking to profit from airdrops. like doing a lot of airdrops, and maybe only a few pay, but from that little, it can be quite a lot of results. however, this year it seems that it has become even more difficult. I prefer to make money from the way you suggest, or maybe by learning trading or staking. from the various opinions that I get, currently working on airdrops just spends time.