Rent-seeking middlemen. This is the pinnacle of capitalism. Taking revenue while providing nothing is maximum efficiency. You can tell because it raises prices invisibly for everyone.
This is just a baby version of how credit card companies have placed a 1%-5% sales tax on the global economy. You might say “at least the CC companies provide a service”, but that tax get’s added no matter if your using a CC or not.
How does the tax get added if you don’t use a credit card?
When you get a credit card machine you sign an agreement saying something like transactions under X amount we, the credit card network company, will charge you 50c or any transactions over X amount we will charge your 1.5%.
Now as a business owner you raise prices 1.5% to cover this fee. If someone pays in cash, the extra 1.5% goes to you, if the customer pays with a card, the 1.5% goes to the card network .