I agree with your statement because these days most of the airdrop is coming from new blockchain network and in most cases these blockchains require a user to do transactions in their mainnet which costs gas fees. After learning from the ARB and OP airdrop some people who receive airdrop from those two projects start farming other airdrop campaigns as well. They are now using multiple addresses to farm the airdrop and doing transactions with real money. Even if they get the airdrop, I am not sure how profitable it will be for them.
Indeed, the last airdrop I got and it's still worth it to this day was TKO, one of the local exchange tokens in my country. I got a pretty good profit at that time and now I still have some that I'm holding. But for airdrop, unfortunately I haven't got it yet. Maybe there really is still something worth it? Because it is very difficult to find it these days.
Actually, I follow a telegram group which contains information on various airdrops. And their principle is to follow as many airdrops as possible, whatever it is, as long as the conditions allow, they will follow it. -Absolutely fantastic. So if you want to make money from airdrops, make sure it's just a side thing and don't expect too much in a short time. Because the process might be really long and not guaranteed to produce results.