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https://en.wikipedia.org/wiki/Marsh_v._AlabamaThe holding in that case is quite narrow: "Constitutional protections of free speech under First and Fourteenth Amendments still applicable within the confines of a town owned by a private entity."
You would have to stretch the definition of "town" to include "website" to have it apply.
>> You can still shout whatever you want in the town square,
> This is such a dishonest conceit.
Fine, then you can go on Gab, 4chan, 8chan or any of a number of other platforms or sites that accept hate speech to varying degrees. There are digital platforms available for that kind of speech.
> The audience relationship is not with people and YouTube. It's with people and a particular creator.
The editorial aspects of Youtube (including recommendations) are certainly within Youtube's rights to control. Youtube is a brand, not an ISP. Creators must establish a relationship with Youtube in order to publish content on it.
There are terms for any such relationship, in the case of Youtube, they are described at https://www.youtube.com/yt/about/policies/#community-guideli...
> If there were a monopoly on printing presses,
There is no monopoly on the technical mechanisms of distributing video online. There are plenty of websites that self-host video content today, and there is no reason that a new provider couldn't attract the creators and audience that Youtube doesn't want.