I am pretty sure it amounts to local law. Wherever the server is physically located are whatever laws can apply. Here in Utah for example you cannot run a pornsite I am pretty sure. Or buy real beer in a regular supermarket
Hell, in Massachusetts you cannot run a tattoo parlor, you probably cannot run a porn site from there either

I can however buy unregistered firearms here in Utah from private individuals and go anywhere there is wilderness and discharge them whenever I want

I like Utah