Well huge fees that paypal charge for money transfer is one of the reasons why bitcoin emerge to be better as payment mechanism. I see the reason why Mr Harris is so against bitcoin because they see bitcoin as a rival to their business.
You are right, as the competition goes by, bitcoin become more popular that makes paypal shrink it's popularity. Many people have known the advantages of crypto that is why many of them transferred to using bitcoin comparing paypal. So that is why Mr. paypal is saying false accusations to crypto.