I'm finding the "private platform, no free-speech rights" argument increasingly thin on platforms aggreggating hundreds of millions or billions of eyes and ears, and increasingly inextricably bound to social, commercial, and governmental institutions and activities. At the same time, the wild west alternative has also proved untenable, with strong civil-rights groups including EFF and ACLU increasingly acknowledging and accommodating this reality.
There's a middle way.
But the founding fathers never thought it necessary to regulate printing presses to ensure the access of minority opinions. The First Amendment was explicitly written to prevent that kind of social intervention.
I think they’d tell you, set up your own server and your own service, it’s not hard.