Except in the sense that the speech being controlled is "X social media platform is better", I don't think it is.

Let me be clear that I think Twitter's new social media sharing policy is ridiculous and likely to cause a Streisand effect for Mastodon and others. Twitter is really harming itself with these policies more than anything else, but time will tell whether they see their own errors and grow up in time to save themselves.

Having said that, what other forms of free speech are being prohibited? I haven't read too deeply into the situation around the ElonJet and related account suspensions, but the justifications they've made were related to individual safety regarding real time location sharing of people in the course of their private lives, one case of which led to someone attempting to attack a person based on their shared location.

I think it's clear that there is some justification for prohibiting public location sharing for controversial figures during the course of their private lives, as it holds little value in terms of expressing oneself freely. Meanwhile, the previous suspensions tended toward expressions which were far less likely to lead to physical harm.