The argument of users of social media platforms having an ownership stake in them because they supported their growth through the sharing of privately owned media might be a bit better but still smells of socialism to me. The users being banned and censored are preforming their actions within the walls albeit virual walls of said social media company.
The best argument the post makes is that there are no other options for the social media user to effectively share their media and therfore they are being discriminated against, but that needs to be tied with the fact goverments are also supporting the social media company by sharing publicly funded media or services on said platform.