Why do PayPal users need to be PCI Compliant? A customer shopping online needs to pay for the stuff he is purchasing. In order to pay customer goes and clicks on pay button and buys the stuff through his bank account, credit card or PayPal. In this case the customer is paying using PayPal and hence the payment is done on a secure page hosted by PayPal.
As PayPal stores credit card account data of customer, so it is necessary for PayPal to be PCI Compliant. You don’t have to worry a bit about the protection of your payment card data and there is no need for you to restrict access to your payment card data.