There is a long history of liability in the USA when you take on editorializing roles. This was broken by the Communication Decency Act (CDA section 230) but case law has is slowly moving back. It is a valid concern.
If CDA 230 were taken away, I wouldn’t be surprised if common carrier laws fell as well. The telephone companies can listen to all phone calls, so they may need to editorialize (mute, disconnect, report to police) on various illegal calls.