No, not this at all and I'll explain why. You have the option to pay with a PayPal balance. This can't be charged back either. By your logic allowing people to send a PayPal balance is just as good as Bitcoin. If I'm a scammer I'm not going to use Bitcoin but I'm going to use a credit card. Therefore PayPal has gained absolutely nothing. Maybe one day they'll shoot themselves in the foot and decide against credit cards altogether and go exclusively Bitcoin. Until that day they have not received the benefit you are describing.