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
1. It's common to happen for airdrop tokens, once the token listed on exchange, the price will fall so deep because no one want to hold the airdrop tokens.
2. Some airdrop will ask you to do KYC verification, for me it's not worth. Trading my ID information with airdrop token that only worth a couple of bucks or even less, so nope for me.