This article by the EFF is really good. I like how they explain their concern about censorship as it pertains to the stack. It’s one thing for a FaceBook and Twitter to ban a user, it’s quite another for App Store and infrastructure providers to do it to platforms. They are, in many ways, becoming part of the web fabric. https://www.eff.org/deeplinks/2021/01/beyond-platforms-private-censorship-parler-and-stack