> Finally, where do you get the idea that companies simply couldn't exist if they didn't remove user content that doesn't violate a few regulations the law woul

> Finally, where do you get the idea that companies simply couldn't exist if they didn't remove user content that doesn't violate a few regulations the law would allow (like spam, threats, obscenity, and copyright, which would all be clearly Constitutional content-based exceptions)? So if I want to run a website with comments I need a lawyer to review each comment? Like how am I, a layman, supposed to determine whether a comment violates copyright or is actually fair use? Or whether it's a "true threat" as opposed to bluster ("Next person who comments about X is getting slapped")? What happens if I wrongly remove a comment?