What Difference would 'Someone Else Owning the Social-Network Site' Make?

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My friend from high-school (now Cultural Ambassador) Mary Millben frequently praises tycoon Elon Musk for planning to promote 'free speech' if he's confirmed as CEO of Twitter. They say Twitter has become "the de facto public square" of today, but it is- (and most other social-network sites are-) privately-owned 'publishers'---maybe not "publishers" in the sense of 'printing and binding a book or newspaper or magazine,' but in the literal sense of 'announcements made to the public.' It makes me think of "NFTs"---'pictures on the Internet' that you can "buy" & "own" (which means nothing but "you have a receipt that says you 'own' it" ... and maybe you can make people stop using it in their blogs & sites).