i.e., "free speech", but only after specifying how the listener should feel about it?
That's one way to look at it.
If someone takes your identity stopping them is not anti free speech though. Mrs Griffin was free to say whatever she wanted, as herself. She wasn't reprimanded for her words but for changing her name to Elon Musk, while having a blue checkmark no less.
You can still take Elon's name if you want but mark the account parody so nobody thinks you're him, it doesn't get more free than that, imo.
Just wait 90 days and see what happens when people snap up the names angry celebs are ditching. Whoopi Goldberg deleted her account, for example, and it will be free to register in 90 days. Will mayhem ensue? The name isn't as important as the url, should they be retired on deleted accounts? They aren't right now....
Perhaps permanently retiring a URL on account closure should be a perk of having paid for a blue checkmark, who knows.
Tip: If you're disgusted with Twitter just turn the tweets private and stop using Twitter, Don't give up your url, it makes taking your identity and fooling others easier.