One of the reasons why the PNB fraud was not detected because RBI is extremely busy , wasting resources making fake money laundering allegations against Paypal account holders to prevent banking fraud like the PNB fraud.

Google, tata allegedly bribed top officials to make the fake allegations, and a huge amount of tax payer money, resources were wasted trying to find non existent proof against harmless hardworking indian paypal account holders for more tha 8 years

Many of these paypal account holders have a very low revenue, almost no cash surplus, yet bribed by google, tata, rbi insisted on monitoring all their activities while ignoring multi crore, billion dollar frauds where the government is making great losses indicating the inefficiency of the government.