I really don't see this as a free speech issue, rather than a freedom of ownership issue.
Just like Trump's TruthSocial, either is free to run things as they want.
I actually I blame the share holders of Twitter for selling out, rather than Musk for attempting to make money.
They knew all along exactly what he intended.
So now it's up to the users whether Musk makes money or not.
I have never sign up for Twitter mostly because I despise the concept of POPULARITY being best.
So I'll never use such social media. Heck I don't even like the rating system on this site despite having known about it for years.
Yet it's not anywhere near the popularity freak show that is on Twitter.