The problem is the 'accepting payments' that you refer to is 'paying by credit card' - where this is usually universally possible - but if you don't have a credit card and want instead to pay with cash by linking your bank account, Stripe doesn't have the mechanism in place to do that yet, in all banking markets in Europe.

Since America is run by its credit cards, I can understand why this is difficult to understand, but a majority of folks in Europe simply don't use credit cards, preferring always to pay cold hard cash. It's just different. And existing payment infrastructures - such as paypal and so on - already solved this problem as well as they can, decades ago, so to be honest its sort of lame to have to be explaining this already about Stripe. Stripe currently has a lot of hype, and as a service it is good for us merchants where our markets are limited to those regions also bound by Stripes' investment into its infrastructure, but outside of that: Stripe is quite a bit mediocre in this market.