Restrictions are usually on specific modes (ie. no violence, obscenity, etc) rather than the content of the speech. Most of the current attempts to restrict speech focus on contents.
What’s an example of free speech being violated now (in the USA debate at least) that’s not about violence? Just curious what you think should be ok to promote without restriction that you think is being curbed.
As the article points out, neo-Nazis have not been allowed certain platforms for a very long time and would get "cancelled" if their views were known. That is content of speech.