Stripe don’t get even close to the full fee of card transactions. Most goes to the issuing bank. They would be lucky to clear 0.8% of a card transaction and it’s likely much lower
For instance here, page 7 [1] in Q4 2016, Square reported a 1.04% transaction margin against 2.94% transaction revenue.
[1] https://s29.q4cdn.com/628966176/files/doc_financials/2016/SQ...
I'd assume their margins in other less regulated markets should be similar
It makes no sense to pay so much for simple payments.
And most of the payment in EU are still done via Debit Card or something similar so they have less leverage.
Along with high level of fraud in US credit card compared to EU.