“And so Stripe only actually owns 6% of the US market, and less than 2% worldwide. So payments is still relatively fragmented, and probably about 91% of payments today still goes through systems that were built back in the 80s and the 90s.”

https://techcrunch.com/2024/10/24/finix-raises-75-million-to-take-on-stripe-as-a-payment-processor/