That's the problem when you offer free unlimited - people take you at your word for it. If Tesla offered me free and unlimited I would use it as often as I could and expect others to do the same and Tesla to build out their network to keep pace. Saying they didn't mean for people not to use it that way is a cop-out; don't offer it if you can't deliver it.
Think of it this way - you can get free, unlimited water from a drinking fountain. This is in contrast to the tap water at your home, where you have to pay a monthly water bill.
Do you exclusively drink from the drinking fountain?
No, that would make you an insane person. You drink from it when you're in the area and thirsty, and otherwise you just get tap water even though it costs more because it's more convenient.
Tesla thought people would handle supercharging the same way. Handy when you're in the area and you need it, but otherwise you'll just charge at home.
Instead, Tesla found that people would just park at the supercharger all day. Queues would form for the supercharger. It's like somebody sleeping at the drinking fountain keeping anyone else from using it. It's like people queueing up for the drinking fountains.
Of course, the reason for the breakdown in the analogy is not everyone had a charging solution at home. They knew the superchargers were available, so they didn't bother getting a solution at home. It's kind of like not calling a plumber to fix your sink because you decide you just won't drink water at home, you'll just use a drinking fountain... which is probably an apt comparison that a few people would actually do if they found their sinks didn't work at home.
So... now Tesla gives a nudge. You can't just use superchargers forever, so call an electrician and figure out how you'll be charging at home or at work.
