Someone decided to take me up on the above. After a relatively long but pleasant conversation, and some pretty compelling points that I hadn't originally considered, I've made a gentleman's agreement to discontinue my private API with the real-time and historical supercharger data. I won't go into more detail, so please don't pry. Suffice it to say there was no legal action or anything drastic involved, and the decision to discontinue my API is entirely mine.
While I know this may be disappointing, the positive side is that I had the opportunity to discuss the usefulness of this data from an owner's perspective directly with the people involved at Tesla. The popularity of the data obtained through my API has at least proven that customers do indeed find the information useful/helpful. Tesla is definitely committed to providing more information that is useful for owners as things progress, and it's possible that they're driven even more so to do this as a result of my exposure of the data for this short time. I'm convinced they'll do the right thing for owners on this matter and will leave it in their hands.
For those of you using my API, I will be changing all sites to report 100% unknown soon. Historic data will be unavailable.
-wk