Paypal requires one to be verified in order to make transactions. To verify the account you need to add your bank's routing number and your account number. Then look at your statement and enter the amount they deposited.
If one were to take a routing number of a bank off their site and guess at the account until he found one. Then guess at the amount deposited, assuming he got through.
Would this be considers identity theft?
Also. If one does not use any money from the account, just to make it verified.