What happens when your host and cdn shut you down? (This has already happened.)
What happens when your isp shuts you down? (Only a matter of time.)
Private companies control the Internet. If we decide social media doesn't constitute a commons, the same argument applies to the rest of the Internet.
And so, like the gp said, your practical right are greatly curtailed.
Moreover, you're giving Mark Zuckerberg immense, uncontrolled power over American discourse. Sure, he has to use his power carefully, but as long as he and other tech ceos do so, they've essentially become the gatekeepers of allowable thoughts.