Basically the "free speech" Elon liberated was transphobia. Which, considering that his trans daughter no longer speaks to him and changed her last name away from Musk, and Grimes left him for a trans woman, and he's publicly posted anti-trans tweets, means he might have an axe to grind against the trans community.

This has led to a lot of progressive twitter either exiting the site or switching to full-time culture war stuff, while the identity-conservatives are basically doing donuts in celebration.