Ironically, Tesla's offer to open up the Supercharger network may ultimately be what makes many of these other cars viable for long distance travel.Public (non-Tesla) charging is a disaster at this time. Between stations being off line, session errors, ICE'd, "removed for maintenance" and never replaced, etc.. etc.. etc.. there is no way to know for sure that the station you used to plan your road trip yesterday will be available today or even next week on the way home.
With that in mind, not everyone uses public charging because their EV is their local driver. For long trips, we still take the ICE SUV because we are 100% certain there will be a gas station to refill along the way or at our destination. If you must EV roadtrip, Tesla has the only reliable charging network at this time.
Enabling the competition isn't ideal for Tesla auto, but for Tesla as a whole seems like a a huge opportunity. Also for the "Tesla Mission" of eliminating ICE.