Tesla building its supercharger network was a brilliant move because it means that Teslas are comparable to most petrol-fuel vehicles (as far as where you can go), and everybody else isn't.
If I buy a Ford, can I drive it to see my family in Northern Minnesota[1]? Because I know that I can take a tesla.
That's a really big deal.
I know there are 3rd parties in the US trying to compete with tesla's superchargers (a very close friend of mine was an engineer at probably the largest one until they went bankrupt), but as far as I can tell they're nowhere close to Tesla.
[1]Originally I said North Dakota, but it looks like even Tesla doesn't have chargers there yet. BOO! Well luckily I have plenty of family in Northern Minnesota too!