In the particular little culture war concerning gender identity, pre Elon you would get banned for "deadnaming" and criticizing the health claims of gender clinics (aka transphobia)
It's flipped now, Elon has tweeted that using cis to describe not-trans people is a slur. Which seems like going the other way on "free speech absolutism" but whatever.
"“A new [Twitter Files] investigation reveals that teams of Twitter employees build blacklists, prevent
disfavored tweets from trending, and actively limit the visibility of entire accounts or even trending
topics — all in secret, without informing users,” Weiss wrote in a tweet Thursday."
It's a very enlightening document, I recommend a full read through
I seem to recall at some point that that old Twitter banned the account of the sitting President of the United States.
Later, Twitter banned a comedy account, the Babylon Bee. That pissed Elon off enough to buy it.
Both are back on Twitter now, both the comedy account, and the politician who will be President for a second term in January, having won both the Electoral College and the popular vote.
That's just two examples, but I would call them salient ones.
