If it's so easy to disrupt visa/mastercard payment network, they wouldn't be able to charge this much. Payment is a highly competitive business. We witnessed so many payment companies went under or were bought out, but these two stay for years and are still profitable.

The truth is their moat is considered very durable and hard to build. A global n banks to n banks payment network is not as simple as how people thought.

If you're an American that 2% is a much bigger problem for your society. That's a direct funnel from the poor to the wealthy, it's not as a obvious a problem as "Trump gave the ultra-rich a tax cut" but it might structurally be more significant.