Paypal is certainly aware that crypto users continue to increase and difficult to stop, this can be seen from the very large transaction volume so that makes Paypal have to follow the trends that occur, and of course Paypal chooses the ERC20 network because it is most popular even though it is more expensive than the Tron network.
Paypal company chose the ERC20 network not only because the ERC20 network is more popular, because when it comes to the most popular networks, I think the Bitcoin network is far more popular than the ERC20 network. Maybe it's because it's easier for them to use or understand, so Paypal himself chose the ERC20 network over Tron. Such an election is of course based on certain reasons so that there is no problem that needs to be disclosed on this matter.