As of April 15th, you have to buy Twitter Blue in order for other people to see your posts automatically.
It doesn’t mean as much to me, since the last time I posted on Twitter was like 15 years ago - but I read it every day, and I’m pretty confident that when the people I follow stop showing up on my feed (because none of them will buy Twitter Blue), I’ll stop reading.
Not everyone in the “town square” hears your spouted crap either. The inference was that there was a fee in order to post on Twitter. I’m not seeing under the Twitter Blue info where your tweets are not seen by the public in the list of perks for having a blue mark.
“Free speech,” legally speaking, has nothing at all to do with Twitter.
But rather than going down that rabbit-hole, I’ll go for the low-hanging fruit - Musk isn’t “charging for the paper” - he’s giving the paper away for free, and charging people to write it.