Nowadays many ICOs offer free coins, but we have two problems with this free coins, the first one the value of this coins will drop after start trading due to a lot have free coins willing to sell it, and the second they ask for your ID (KYC), and i think it is very risky to send your IDs to any one.Please vote to help others
I think it's alright to join in airdrops but don't give your identity as long you don't have assurance if that project is really have future in crypto. But of course no one can say if the project will be scam or not that's why it's important to research before we participate in anything.