There are very real business reasons they don't do that though. One, is that algorithms that decide what you as a viewer want to look at are very successful at

There are very real business reasons they don't do that though. One, is that algorithms that decide what you as a viewer want to look at are very successful at keeping you on their platform. Two, once any company chooses to filter content to make it more palatable to users, they start taking on the legal and PR risks for it.