No new legal precedent has been created, nor has any existing legal precedent been changed. Youtube has always had the right to curate or ban content for any reason, and has always done so, albeit typically in service of advertisers and copyright owners. Legal precedent has never recognized "freedom of speech" to mean that no form of speech can be abridged or forbidden, rather, it has recognized that censorship is permissible under certain circumstances for the common good (laws against slander, libel, fraud, perjury, etc.)
>As to your point of information that can potentially do harm, who gets to be the judge of that? That seems like it can be very controversial and subjective.
Just because it can be controversial and subjective in some cases, doesn't mean it is equally controversial and subjective in all cases, nor does it follow, therefore, that no cases can reasonably be judged by any criteria, because all cases cannot be equally judged on exactly the same criteria.
>Otherwise we run into scenarios where people start claiming "your opinions and words I don't agree with are considered violence against me". At which point ALL speech is fair game.
The problem with the slippery slope argument is that it assumes humans merely process the law like algorithms, and that it will consider a statement like "your opinions and words I don't agree with are considered violence against me". perfectly valid merely because it is logically consistent. Even without "objective" criteria for limits to speech, someone making the argument you're presenting will be laughed out of court, both of law and public opinion.
The only way the slope can be slippery is if no one had ever looked at the slope, considered that it might be slippery, and maybe added a sidewalk or some stairs or a railing or a sign or something. We as a society are already aware that the dynamics involved in something like speech can be complex, and that the potential to abuse freedom of speech exists. Feedback has already been added to the system, because the system is self-aware and self-correcting. It may not be perfect in that regard, but it's still there.