Consider this: imagine the guy sat next to you at work starts yelling at you with a loudhailer all day. Every day. And he never ever shuts up. (Alternatively, imagine that he just whispers "fuck santosh" all day.) Would you expect him to be free to continue doing it? Would you expect the government to stop him? Or would you expect your employer to stop him?

The answer is: groups of people (and corporations are groups of people) are free to limit speech according to whatever rules the group decides upon. What you're proposing is that certain large corporations be treated as quasi-governmental entities. Which is a _free-speech restriction_.

Not saying it's a bad idea, necessarily. But I'd rather my freedom to say that certain types of speech are unacceptable was guaranteed.