I think its good to implement kyc for airdrops. It should minimize people making many fake accounts with stolen data to get airdrop tokens. Also if they require kyc then you should be wary of giving out your info. Do your due diligence and find out about the company or team. Always be careful
They should use some other ways to fight against users who abuse air drops. But asking for your personal information and your ID isn't the best way. And one should not even give away their IDs that easily. "It should minimize people making many fake accounts with stolen data" - here the irony is that, they can steal your IDs and sell it. Most of the ICOs and airdrops are scam. They can use your information you provided to do illegal activities.