> Nowadays, the public square, the thing that the constitution is supposed to protect, which is the difference between feudalism and democracy, is de-facto (though not de-jure), owned by monopolistic corporations.

That's quite the exaggeration. You can quite literally still gather in a physical public square. Just because it's more convenient to do so online doesn't mean it's a granted right.

> The vast majority of public discourse, news and financial transactions take place on these feudal fiefdoms.

And? If a bank decides they don't want you as a customer, you can still perform cash transactions. You aren't entitled to a bank account just because the majority of people do banking.