Well, here in Germany, maybe europe in general, you can't assume that your customers own a credit card. I like Stripe a lot, but using it as the only payment option wouldn't work for us.

Credit cards have become more common here recently but for a long time it was either Paypal connected to the customers bank account or plain old bank wire transfer. Sure, there are some niche services like Sofortüberweisung, but they never gained the status of Paypal.