I'm happy to weigh in here.
As it relates to YouTube, we take an approach that's similar to others'. Specifically for us, our recommendation systems raise authoritative and high-quality information and reduce the spread of low-quality information. We view our recommendation systems as one of our most effective lines of defence in combatting misinformation and preventing exactly the spread that you've referenced. Also, removing content at the source is really critical to making sure we stop the spread. That's obviously where our community guidelines come into place, as well as the content moderation policies that we do at scale.