Visa and Mastercard aren’t skimming 2.5% off the economy; the majority of the interchange fees go to banks (which Visa is not; their actual product is VisaNet which provides payment infrastructure, broadly.)

Trivially verifiable by Visa’s revenue being $35B, which is not even close to 1% of just US GDP (about $30T).

Cash costs more nearly that much when you count all the time spent counting and recounting it - at least 8 times for every transaction. (the buyer finds and counts, then the cashier counts, then count change. Then the manager counts and recounts the till, finally the bank counts and recounts it - several of the above will come up with a miscount and recount additional times to verify). Then we add crime loss on top of that.

visa is saving the country a lot of time/money.

"from my pocket to some rich investor somewhere"

Or your retirement account. Everyone is mad about investors and companies making money. Sure, there are ultra wealthy people (mostly founders) that benefit disproportionately. However, most people who hope to retire some day rely on a 401k, pension, etc which is dependent on stocks. Retirement accounts have about $36T in the US, mostly in equities and corporate bonds.

Not the entire economy, just retail and some b2b.

OpenAI isn’t putting two billion in GPUs on their corporate credit card.