My position is that when a private company has so much power that it rivals nation states in the control it can exert on public discourse, it should be limited

My position is that when a private company has so much power that it rivals nation states in the control it can exert on public discourse, it should be limited in similar ways to the way we limit political power with first ammendment protections. The case for such free speech protections is essentially the same as the case for the first ammendment restrictions on government power. Arguably, the case is even stronger, since private corporations have no democratic accountability.