Are you stating as fact that Google is preventing your bank from publishing their app to the Amazon store (or any other android app stores)? Isn't it more likely the case that your Bank chose to only publish to the Play store?
Are you stating as fact that Microsoft is preventing your OEM from selling a computer with Linux (or any other non-Microsoft operating systems)? Isn't it more likely the case that your OEM chose to only sell and support computers running Microsoft operating systems?
Are you stating as fact that Microsoft/Apple is preventing companies from writing software for Linux (or any other non-Microsoft/Apple operating system)? Isn't it more likely the case that those companies chose to only write software for Windows/OSX?