One of the classic roles of the government is to prevent certain unfair business setups. For instance, providers of a service aren't supposed to have agreements

One of the classic roles of the government is to prevent certain unfair business setups. For instance, providers of a service aren't supposed to have agreements to not compete and carve off markets from each other. Likewise price fixing is prohibited. Apple already lost here when it attempted to prevent people from even linking to other payment platforms. That was "their platform" until it wasn't, thanks to a court. Giving them exclusive control to police speech - legal speech - without an opt out that doesn't involve thousands of dollars of loss is also "part of their platform" today. I actually disagree with the ICEBlock app.. but that's for the courts to decide if it's legal, not a private company.