Requiring certain walled gardens to not publish certain apps is a form of censorship. But it's not exactly "splitting the Internet." Everything's still connec

Requiring certain walled gardens to not publish certain apps is a form of censorship. But it's not exactly "splitting the Internet." Everything's still connected together, it's just that certain sites aren't allowed to host certain material. I have a few questions. Would this apply only to Apple and Google app stores? Would jailbroken phones still legally be able to install the apps? Would third-party app stores legally be able to distribute them? If the government tells an app store not to sell a specific program, isn't that similar to telling a bookstore not to sell a specific book? How does the government argue that the free speech protections of the Constitution don't apply?