Or they can be conduits and avoid this risk entirely.
Edit: This quote though seems to be wrong: What competency do tech giants have to arbitrate over science and health policy? … How did they get into a position of some sort of philosopher-king to be able to sit in judgement as overlords of our discourse So yeah, clearly each platform has control over what is acceptable to say on the platform. Encouraging free speech is important, but that takes work. Rule with an iron fist is the default for any platform, even blog comments.
Sadly, the drug has been highly politicized and all positive discussion around it was banned from YouTube. The OAN channel in YT was banned for talking about it: https://uk.reuters.com/article/health-coronavirus-youtube/yo...
There are many other instances of YouTube censoring discussion that results in a harmful effect to society. For example, most popular channels posting riot videos were demonetized.