The analogy holds no water, it is infinitely easier to broadcast your speech on another platform (or make your own platform) than to deal with state level censorship. Publishing them on a company's dime and expecting platform neutrality is preposterous.
It's not easy to make a new platform. it's insanely difficult. These big social media companies have huge moats at this point, due to network effects and scale.
When other things have such powerful network effects we force them, through the state, to treat people fairly. For instance, utilities like water and electricity are natural monopolies because of the limited physical space for the infrastructure. Social networks aren't quite the same but there are powerful similarities.
