Day in day out there are new projects requiring kyc from investors
Exchanges requiring kyc, for some in order to maximize your ability to withraw large sums of cryptocurrencies and some even before you can trade on the exchange
The bigger question is how safe are our kyc documents?
I have read a lot of bad reports about KYC in bounty campaign, KYC and exchange verifications but of the three I prefer to do KYC to exchanges than airdrop and bounty campaign because exchanges are more compliant than the two, and besides I cannot do a trade on most exchange if I will not undergo KYC.