If you do not have any capital and you have a lot of time, most of your attempts may be positive, and you can act with these possibilities. Also, in times of NFT hype, it might be better to spend time on this kind of work. It's really not easy to earn free money. If you only expect airdrops, you can usually regret wasting your time. That's why it's best not to expect.
Following the NFT hype doesn't waste time if we only follow the airdrop program / NFT rewards on potential projects, so we don't need to join all airdrops to get free NFT but must be selective in determining the airdrop of potential projects before joining to get free NFT.
I will not equate them all, yes, it will be a waste of time for those who do not profit from it but it will be very useful for those who know how to use it to make a profit. Currently, I am not participating in free mint projects because I don't have too much time to look for them, many people can't make money from it but I also see many people can make money from it just need you to research and screen before joining. It's like testnet, many people don't join because they think it's untrustworthy trash like airdrop, but also many people can make thousands of dollars from testnet, Aptos is an example for us to see. It is still important to choose the project to implement.