Several restaurants around you (I've never seen one, ever) being bigoted and rejecting business, does not mean your general statement is true. 99.(99999?)% of physical businesses also take cash. A blanket generalization, like the statement to which I replied, is based on - umm - the general case. a .0001% case of it being true doesn't make it true.
Trees you see, don't grow on land. Because I saw one growing through the water in a shallow lake once.
Here in the real world, the polar opposite of what was stated is actually true. In fact, I'll bet you a lot more businesses Only take cash than only take credit. Adding credit to a business that does cash (most businesses), is expensive. Adding cash to a business that does credit (count them on one hand) is also expensive.
You seem to not understand that, so I do have more tree and fern examples - just ask. You'll have to wait a couple of days if you want other kinds of flora however, as my brain turns slowly.