Having worked in an industry with strict kyc requirements and worked for a well known payment processor, if they were only catching 1% then some truly absurd amount of business is fraudulent.
Curious about numbers. Many people underestimate the scale of business in general, because they're not good at intuiting extremely large numbers. For example, an abuse tech might see 10,000 pending cases for the month and say "Wow, we catch so much fraud with this technology", but if there are a billion transactions per month, then it's very possible that those 10,000 cases represent only 1% of the million fraudulent transactions and only 1 in a thousand transactions is actually fraudulent.