I was talking about intention and damages.
Say Bob is an idiot, he publishes a video with a flawed experiment where he proves the Earth is flat. There are no damages and Bob really believes Earth is flat so a judge will not find this idiot guilty.
Other case, Bill is is greedy bastard, he wants to sell some pills that make penises grow, Bill uses Phtotoshop to make a false medical diploma, Bill also creates fake studies to show his pills contain some magic shit, Bill also has some partners that know this is bullshit (and there is evidence in emails on how they plan to sucker people). IMO this is a clear case where an ad, or FB post, or blog post that uses fake studies, fake credentials, fake documents intentionally to cause others harm is something a judge can act on and no free speech should allow intentional fake advertising/promotion . But say Jimmy is an idiot and he also shared this because he is stupid, he will not be found guilty.
Say a political group also uses Photoshop, or fakes documents or uses a third party and asks them to create this fake evidence then they should also pay.
So my point is that not FB or YT does the police, but if we have laws and make the guilty pay then there should be less intentional publishing of fake shit.
We are still left with idiots that believe false shit and the foreign actorsm paid trolls, maybe you can think on ways to catch this paid foreign trolls.
What FB and YT can do is to update theyr algorithm to not amplify this garbage, your free speech right is not giving you the right to be amplified and promoted, you have the right to share to your friends the latest conspiracy but Fb has the right not to push it to others with their shit algorithm.