You can look at phone companies then, for a similar example.

It is illegal, due to common carrier laws, for a phone companies to engage in certain actions. They are actually forced to accept certain customers.

These existing laws that apply to phone companies could be expanded to apply to other forms of communication networks.

It's a bad example - phone conversations are relatively private and not meant for public consumption.

If this was P2P messaging I'd agree. But that's not the case here.