You can simultaneously believe that financial transactions are private communications, and also that a securities broker being required to verify their customer's identity pursuant to KYC and AML regulations is reasonable. Your post is very vague (since the comment you're giving thanks to focused on a semantics "gotcha" and completely avoided the actual point) so I'm curious as to why you think KYC/AML regulations are invalid and brokerages and centralized crypto exchanges shouldn't be subject to them in the light of "private financial transactions".