This is where it gets tricky. Because 99.9% of the popular internet is 'non state-managed platforms'.
There doesn't exist an avenue to meaningfully exercise free speech on the internet. You can make your own blog, but it will never go viral. Because the only means for something to go viral is that 99.9% composed of privately censored platforms. We've gotten into a situation where censorship has changed shape from 'one is prevented from expressing a view' to 'a view is prevented from reaching an audience'. Which is far worse than old school Stalin era censorship.
This is not an easy question, but it is clearly a case of the law needing to be updated in light of how technology has evolved. We can't claim to have free speech if there's de-facto no way to exercise it on the primary communication channel of our time.
Concrete example: it has recently come out that youtube has been silently censoring a wide array of comments that express anti-china views. Like most users, I was completely unaware that this is going on. Youtube distorted my perception of reality by suppressing an entire class of opinions from being visible. They didn't tell anyone that they're doing it, there was no transparency, and when they were caught, they said 'whoops it was a bug sorry lol'. That's crazy. What else are they suppressing? I do want laws to stop that even if it exposes me to comments I don't like.
Or consider the degenerate case: Imagine Facebook takes over the entire internet. They buy Google, they buy Twitter, they buy pretty much everything than an average user will ever see. And Zucc comes along and says, from now on any mention of a certain political view on any of these platforms will be censored. This is ok by the rules you're proposing, but it's clearly not ok in terms of the spirit of free speech laws.