The value is that it's easy from the perspective of the user. You mentioned that you use Revolut for one thing, direct card payment for another, and other tools

The value is that it's easy from the perspective of the user. You mentioned that you use Revolut for one thing, direct card payment for another, and other tools for web app integration. PayPal offers all that in a neatly packaged solution. It's no surprise users would choose that instead of 3+ different services that serve different purposes