MAGA talks about free speech but doesn't believe in or practice it.

Believing in free speech is neither left nor right, it's on the freedom/authority axis which is perpendicular. Most people on the left never advocated to legalize libel, defamation, racist campaigns, although the minority that did still do today.

The "free-speechism" of the past you mention was about speaking truth to power, and this movement still exists on the left today, see for example support for Julian Assange, arrested journalists in France or Turkey, or outright murdered in Palestine.

When Elon Musk took over Twitter and promised free speech, he very soon actually banned accounts he disagreed with, especially leftists. Why free speech may be more and more perceived as right wing is because despite having outright criminal speech with criminal consequences (such as inciting violence against harmless individuals such as Mark Bray), billionaires have weaponized propaganda on a scale never seen before with their ownership of all the major media outlets and social media platforms, arguing it's a matter of free speech.

There’s no such thing as free speech and there never has been. To believe there is, is to fundamentally fail to understand what a society even is.