I read it already from your link. You implied or out right said it was joke. I still don't see the joke whether it is your humor or not, I see no joke even implied in these definitions.
Since we are well off topic talking about a "joke," or lack of one, I won't bother with any more replies unless I feel it address the subject at hand which is "What's An Internet Sub For?" To me my sub is part of my real life and fills a gap of what is missing in my off line life. And she fills it nicely with love and submission that makes us both happy. Bottom line, that is all that is important, being happy with your circumstances.