There was also a 1946 case from Alabama in which a company town tried to bar protestors and was prevented from doing so by the courts under similar logic ie “town square”.
There’s a good case to be made that Amazon, Google/Youtube, Facebook and Twitter are monopolies (it’d be a much tougher case to argue that against Apple). The “town square” rationale is another. Net Neutrality and the reasoning behind it is another rational basis for introducing regulation that would prevent censoring any but clearly illegal speech like kiddie porn, terrorism or making terroristic threats.
We cannot allow a few tech giants to come to utterly dominate the internet - like the do now - gaining their current size with a relatively free libertarian ethos and then once they’ve gained dominance impose draconian Leftist censorship. That would be very harmful to democracy and free speech. These have essentially become media companies rather than mere conduits which had no editorial oversight and therefore need to be regulated as such.
“We cannot allow a few tech giants to come to utterly dominate the internet”
Use an alternative.
I do. But then that is just me being proactive.