Please listen this episode from Darknet Diaries, about a vietnamese guy that became from a simple "hacker" on darknet a real "provider" and reseller for data brokers... the real danger of your KYC data.
The danger of KYC is that your personal information get into various hands, by selling it (without your consent !) and used for various purposes.
Very interesting story and how the system is fooling you, the final user.