Selection bias. You do not see all the times paypal has successfully frozen an actual criminal organisation (i have no idea the numbers). If paypal's accuracy was 99%, then there would be 1 innocent startup squashed for every 99 successful defections. Do you think paypal need 100% accuracy?
At the end of the day, letting criminals dictate how you do business with legitimate customers is not OK.
Simple due diligence will either eliminate the genuine criminals, or it will not. If five minutes' worth of due diligence by humans fails, then so will any conceivable AI algorithm.
