Because YouTube, Facebook will flag these videos before they become too widespread.
The tech world in general needs to wake up about the overreaching power and influence tech companies have on our lives.
Even with more egregious examples of moral wrong and stupidity like shutting down child molestation survivor support groups or just bad decisions like buying up Tumblr and trying to sanitize it weren't like but accepted as fundamentally how it works when it is their servers. There is no viable alternative to stop them from setting their rules. Even if they die there is nothing stopping them from taking their ball and going home.
You have to remember we are in a little bubble of our own for better or worse, most of HN readers principles are generally aligned against this kind of centralisation and we highlight and amplify anything we see that matches; I'm guessing your average FB user is more focused on the value proposition of these services they are consuming and wont give the corporations behind them much of a thought until it hits big news.
In contrast, for the average person, Google is just the free little search engine that shows you all the answers and also gives you the free phone software. Whatever egregious privacy violations they do are wrapped up in a layer of abstraction that, if you don't get technology, can be hard to grasp.
The next generation is smarter though. They understand technology fundamentally and know that there's no such thing as "free".
But seriously: at best it's going to be a big "maybe, it depends". These services bounce between PR disasters of "complicit purveyors of propaganda" and "oppressive algorithms destroying free speech", so you can't rely on them to be on either side.
As deepfakes get better, the algorithms will have worse detection rate, so it'll end with Zuck testifying to congress that Facebook doesn't want to decide what is real, so everyone can post deepfakes all day long.
I don’t see any sarcasm there.