Imagine if Borders bookstore told Amazon that they cannot compete with brick and mortar stores because customers can't send cash through the mail? Would it now be Amazon that is bankrupt instead of Borders? Whodathunk it?
You know this is pretty much word salad, right? This isn't about one business telling another that it can't work for some made-up reason, this is about a real, fundamental disadvantage one payment method has over another that isn't going to go away just because you want it to.
Businesses criticize each other all the time. You said so yourself.
Imagine Amazon started offering 5% off with Bitcoin. Visa tells them to stop it or they'll lose their account. What do you think comes next?
It's called competition. Amazon will choose bitcoin because it's cheaper. That is unless there are no anti-monopoly laws in which case we are all screwed and will end up paying whatever the banks will force us to pay. If that happens, then a bitcoin based online bookstore will be able to out-compete Amazon for prices.