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.