Stripe aren't even in the top 3 for payment processing.
-Global Payments: $2.8 trillion
-JPMorgan Chase: $2.45 to $2.6 trillion
-Fiserv: $2.2 trillion
-Stripe: ~$1.9 trillion
-PayPal/Braintree: ~$1.9 trillion
-Global Payments: $2.8 trillion
-JPMorgan Chase: $2.45 to $2.6 trillion
-Fiserv: $2.2 trillion
-Stripe: ~$1.9 trillion
-PayPal/Braintree: ~$1.9 trillion
Stripes fees are uncompetitive, even their negotiated rates, so businesses tend to leave them as their volume grows.