I can conclude that fake airdrop projects have criteria such as easy requirements, offering token prizes of hundreds of dollars or even thousands of dollars, requiring participants to do KYC, sending ETH gas fees to claim airdrop tokens, and many other criteria. and you need to avoid if you find this kind of airdrop.
Yes if any airdrop asks you to send them some fees or gas or any kind of payment to claim your coins, it is nothing but a fraud airdrop and you must avoid that immediately.
Basically you have to think that if you participate in 100 airdrops, 99 airdrops are scam. From my personal opinion in the last couple of years, i have only received 3 airdrops which is acutally worth in the market and the rest are cheaters who didn't send me tokens. So there is no machine yet to determine which airdrop will pay you or which will not pay. You have to do with your own will.
That's true but the more information you have the higher that percentage goes, you mentioned like 1 in hundred which means you have achieved 1% of the value from coins and if you can just do some more research and find more about the coin, what their idea is behind the coin and why they are offering the coins for free you can actually increase that number to at least 5-7% and yes it is impossible to detect all fraud airdrops.