Sorry, but what does that have to do with the messaging that everyone is going on about? The original messaging was 'for long-distance travel'. Because they have some exceptions doesn't mean the exceptions negate the clearly stated intention.
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I see nothing in what Elon said that would indicate he was saying 'feel free to charge locally instead of at home'. I do see him saying there are specific situations that they have put in a solution to address.
An intention does not, though, automatically communicate limitation - especially when combined with mentioned exceptions and sales talk emphasizing the free for life part. The intent, so far, had merely dictated the locations of the Superchargers as far as the public was concerned. Tesla's guidance on courtesy included only instructions to move the car once finished, which of course is perfectly reasonable.
Tesla adding limitations on use to their wording - and to their (soft) action in the letters - is now new.
Since people like analogies on this thread, in my view this is like a store offering coupons. They are calculated to, on average, bring in more money. But we expect stores to honor them even in those cases where someone collects them, strategizes and then uses them in an unusual manner that costs the store money, because that is a part of the equation. The idea is to create the campaigns and prices in such a manner that such fringes are offset by other users. Or take insurance. By all means change the terms for future contracts if need be, but existing ones must be respected independent of what mix of pay and cost insurance customers you end up with. (In Tesla's case the new contract term would be a new car.)
Similarly, I have "paid" (in the price of the car) for my very rare Supercharger use much more relatively speaking than those who are able to actually use them due to regional availability. I won't expect Tesla to compensate my either for lack of use (they save money on me), because I don't use the service - it comes with the territory just as occasional large users do. It was Tesla's choice to offer a fixed-price, for-life-of-car service, they marketed with that message and got sales - and it is their responsibility to calculate it all, to be clear about it and to honor the commitments they make, even if they turn out to be unwise ones.
Many of us would normally expect nothing less from any business. I get it that some here are so concerned of Tesla's mission that they may alter such priorities and I respect that difference of an opinion, but I look at it from a business ethics point of view. On that note, while I think the letters may have been a bit ill-conceived PR wise, I do still fully expect Tesla to honor those commitments in practice for old owners, so this is just commentary on the discussion and on these reported letters. Tesla should just be very clear to new buyers on what they can now expect, if they are making changes. For existing owners, I do believe they will overall continue to do the right thing.