It's not about "just raise prices", it's about some industries (e.g. upstart restaurants) that already have massive failure rates and have hyper competition. Even airlines don't make money on flights, and instead only on selling credits cards or other perks.
If your operating costs are some percentage higher for accepting cash versus the coffee shop across the street that doesn't, you're more likely to fail.
If your operating costs are some percentage higher for accepting cash versus the coffee shop across the street that doesn't, you're more likely to fail.