No, they actually don't get to do that. That's the point. Your ignorance of the law aside, the Communications Decency Act says they are immune from liability, ONLY if they act as a platform not a publisher. Once they start editorializing content they are not a platform anymore, they are a publisher. They do NOT have a legal right to Terms of Service that include them editorializing content UNLESS they want to give up their CDA exemption. So if they want to editorialize content then they have to give up their immunity from liability. It IS the law. They do have to choose between cultivating content and being immune from liability. I really wish people would learn about things before they started spouting off that their opinion supersedes the actual law.