Okay, I found the answer. KYC stands for “Know Your Customer,” and it's a process where exchanges and services ask for identity verification—like name, ID, and sometimes proof of address. The main reason? Regulations aimed at preventing money laundering, fraud, and other illicit activities. So, even though Bitcoin itself is pseudonymous, platforms that let you buy or withdraw it often need to confirm who you are legally. If you're curious about how it works in detail (what info they collect, how they protect it, why it's necessary), check out this breakdown on KYC bitcoin
What is KYC and Why Is It A Requirement for Crypto Exchanges? - Paybis Blog . It really helped me understand where privacy ends and compliance begins.