It's because the pendulum has taken a noticeable swing in the reverse direction, with online mobs getting people fired because of opinions they've expressed. Extreme labels like "white supremacist" and "Nazi" are being put on people for views that deviate from approved ideology. This is creating a climate of fear in which each case of someone getting fired is enough to cow thousands if not millions of observers, who fear to lose their own jobs if they speak out or even slip up. Bogus arguments like "it doesn't count unless the government does it" are being used to dismiss free speech concerns about this. To me it seems obvious that from a free speech point of view it's fine for people to respond to each other with criticism, even if they're mean and mischaracterize each other, but getting people fired crosses an obvious line into non-speech and physical harm. It's not as harmful as physical violence or putting someone in prison for what they say, but it's on the same spectrum, and the psychology of the zealots who want to see people punished in this way is unmistakeable. That's where the comparisons to the Soviet Union, China, and so on, come in. Anyone who is familiar with the history knows the type, even if so far they are unable to do more than exert power over employment.

There's also deplatforming, which falls in between pure speech (such as criticism/debate) and physical harm (such as firing).