There's also an execution problem.

Truly knowing your customer might produce very different outcomes than the current compliance checkbox approach.

"I know Fred just sold his old car. The idea he suddenly has $12k in cash is not suspicious" or "Jane's been talking about going to Montreal for momths. We should not block her card when it lights up there.". That's real KYC, but it requires human connection and human judgement, which doesn't scale and doesn't provide the right paperwork for demonstrating compliance with arbitrary mandates.