We shipped a fiat-to-crypto onramp and watched the queue grow. Not the payment queue, the moderation queue. Real-time KYC meant a human had to look at every borderline case, and we had designed for request volume, not for how fast a compliance team can actually decide.
Now we size review tooling before we size throughput: batching, clear reject reasons, no ambiguous states. Somewhere your system probably assumes a person keeps up.