Nothing will stop a scam project. Because as long as I know crypto from 2014, no one has been able to filter out good projects or projects that are scam.
Talking about airdrops, from last year there were indeed many scam airdrops. Except for the bounty.
If we talk about bounties, I see a different year from 2018. Because not too many new bounty projects emerged when bitcoin went up very high in price, but they still paid and weren't a scam.
Unlike 2018 when bitcoin rose to $ 20k many new bounty projects emerged but 99% scam
I thought, if you don't want to do futile work, then don't go in the airdrop. Better to work on the bounty