The post is about resilience to censorship from outside organizations. That is, it's about governments not being able to selectively block content from service

The post is about resilience to censorship from outside organizations. That is, it's about governments not being able to selectively block content from service providers. What you're talking about is the service providers themselves deciding what form of speech is allowed on platforms they own. Some may feel that it's inappropriate for Microsoft not extend their platform to white supremacists. Others may think it's inappropriate for service providers not to provide extend their platform to ISIS or Al Qaeda. You may feel that service providers should provide a voice to any possible opinion, but the organizations actually providing the service don't feel this way.