Everyone has been trying to buy Twitter. I don't think they are going to be willing to sell.
If Musk bought twitter and got rid of all the moderation policies (save and except for really illegal stuff like child pornography, etc.), then no one would want to be on twitter anymore. The main attraction of twitter is spending half your time complaining about who got banned who shouldn't have been banned and who didn't get banned who should have. Take that away and people will quickly realize that it is actually a pretty stupid social media site.
Also, if you look at the trajectory of 4Chan, 8chan, 8kun, etc., you will see that a moderation free twitter would quickly be overrun with white supremacists, incels, and Pepe fanatics (sound familiar?). Any revenue twitter made from advertisers would dry up immediately as every other post would be lude harassment or Pepe memes, driving away users.
And that is the paradox of social media and free speech. If the social media site has to make money, it is going to have to have controls over content to keep it from turning into another 8chan and losing advertisers and users. And if the site doesn't care about making money and has minimal moderation, it will become such a cesspool that no one will want to use it. And the irony is that the real issue with twitter isn't free speech. It is about having access to the attention that twitter provides users. There have always been and always will be social media site that have extremely limited moderation. But they invariable get taken over by the worst of the worst and never get anywhere near the size of the sites that have very active moderation. So, Musk can buy up twitter and unleash the Pepes and incels and within six months everyone will flee the site and move to one that has lots of moderation.