The limits of free speech are defined by your governments constitution. In our situation, the limit is you can say anything critical without fear of government censor. The limit is you can’t promote violence or fighting words, which courts have repeatedly upheld hate speech and other words to be. Elon Musk wants to allow racist nazis like Richard spencer and trump to say intolerant bullshyt without consequence. If that’s the case he can make his own fukkin social media website that caters to the alt-right, there’s absolutely nothing stopping him. But as all those right wing platforms inevitably show is those racists and conspiracy theorists eventually descend into murderous mobs like at the Unite the Right rally, or the crazy fukks at Jan6th, or the mf’ers who were shooting up pizza places because of something QAnon said.
the reason he doesn’t and specifically wants Twitter is because it already has a user base that he can more easily project and brainwash with his weird South Afrikan weeb shyt.