See my comment about the pros and cons of Paypal above @agneslaczo :)
I think the ultimate point - and in my opinion as well - is that Paypal isn't "terrible". It's actually really good at what it does. However, it can be thought of as the best of old, dot com era internet technology. Cryptos are Paypal 3.0. (Skipping the 2.0 ;) )
I think this is more or less along the lines of what @dahlsom said "PayPal has been around longer and uses a more familiar technology." ...would you agree with my above statement @dahlsom?