People who advocate Free Speech on the internet seem to usually mean Speech Free From Criticism. The "anti-free speech" things they complain about is just other people excising their own free speech.
In my experience, the "anti-free speech" things they complain about are generally the actions taken by powerful private institutions (PayPal cutting people off, complete bans from the Social Media town square) that prevent individuals from having the right to exercise freedom of speech in practice.