No, there are so many fake and shady airdrops, so you have to be very careful before participating in any airdrop nowadays. There are many hackers and stealers trying to steal cryptocurrencies by spreading the word about their scammy airdrops. Especially don't make any KYC or give your private keys to any airdrop.
mostly yes, many airdrop program could not continue their project and finally dying. If they required some eth or private we have to avoid it. Hackers behind on this program. Many saya that used to lie us in airdrop. But by this case we should not generalize airdrop. But some pay us too in huge amount.
Well it is an airdrop which means free coins and when they ask even a little amount of money or ask too much information then it is safe to say that it is only a scam and they will use the information you have entered there in some illegal things. Analyze the airdrop first if it is a legitimate one then join but if you cannot see if a airdrop is a scam or not better for you to stay away from it, the money you thought you'll get will not be worth it once a hacker gets your information.