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?
How safe KYC is, it depends on the project you are following. The important thing is that it is not easy to do what they ask for. We should be able to examine because not all projects that use KYC, are trustworthy.
Our personal data is more important and if used by irresponsible people, of course, we will have a loss.