If you have free time, then you can use your time to participate in airdrop, but if not then you should do it for more useful things. Airdrop can indeed generate profits but many airdrops are just scams, do research first for the airdrop that you will follow, to produce better profits.
Yes, you are right. Airdrop is one way to get several tokens or coins for free by just doing a few small things and not taking a long time. However, at this time airdrop is no longer profitable because the results obtained are relatively small and not useful. At the moment I am not interested in airdrop anymore. Everyone has a different assessment, doing research before doing something about the project is good advice.