In reading the link that Skypilot56 posts above, I found perhaps the most intriguing statement in it to be:"... when human health is at stake, perhaps search engines, social media platforms and websites should be held responsible for promoting or hosting fake information."
That is, the argument goes, by providing the means by which false, and therefore potentially damaging, medical information is provided, ISPs and others involved who do so should be held legally liable.
But in reality it doesn't work that way.
It seems that current law provides ISPs in particular with a large degree of immunity from prosecution for the content that they provide. The argument goes that the amount of data flowing through even a small ISP is so vast that the ISP can't possibly regulate all of it. However, the law also states that, once notified that there really is actionable material within its system, the ISP then becomes legally obligated to remove it, and does become liable if it fails to do so.
For those interested, here's a short article that discusses these potential online liability issues. It's a few years old, but it states the matters rather well, and I believe what it says is still current:https://www.thompsoncoburn.com/insights/blogs/internet-law-twists-turns/post/2013-07-09/isps-and-content-liability-the-original-internet-law-twist
The implication from all this is that, again from what I have read, holding a person or entity legally liable for propagating medical misinformation online would be very difficult to do. Take, for example, the statement "laetrile cures cancer." While there is no scientific basis for that claim, there also does not appear to be any legal grounds
that could call for its removal from Internet sources.
It also seems, BTW, that the vast majority of legal actions involving actual possible removal of offending content from ISPs and therefore websites, from what I read, revolve around copyright infringement and personal defamation. So legal action to remove medical misinformation does not appear to be an option at this point. Not that I have been able to find so far anyway.
Thus it's probably not possible to eliminate the laetrile-type claims out there on the web, other than to do what one can to discredit such claims, while rightfully encouraging dissemination of accurate medical information instead.