This does seem to be the root cause of so many of these problems, doesn't it? As useful as I find YouTube for finding interesting music, I'm very aware that its programmers' main aim is to keep me on the site as long as possible. So many problems around dangerous conspiracy theories, misogyny, racism, and all the other -isms and -phobias seem to be accelerated by the way it keeps feeding its users more videos without any serious checks on the information they contain. I can very easily see how you could start by watching a balanced, well-argued video about downsides to immigration, and be only a few clicks away from a massive rabbit hole that leads you to believe there's a satanic child abuse cabal meeting in the basement of a New York pizza restaurant, and you absolutely must march in there with your gun, demanding answers.
Point being: there's an awful lot of responsibility that could be arguably dropped at the feet of the companies who own and maintain these platforms. Of course they scream "censorship" whenever anyone suggests they should do more to regulate their content - it would cost them money! But like gambling or tobacco before them, there's surely got to come a point where they meet a serious reckoning regarding the number of lives their laissez-faire approach has derailed - or even cut short.