At least in the US, almost every automaker has contracted with Tesla for access to the Supercharger network. I am aware this is still a chokepoint that Musk could exercise control over while having a controlling interest in Tesla.
I bought my Tesla in 2014 and have 100k miles of free super charging behind. total number of non-Tesla’s I have seen in 11 years charging - exactly two
The subset of Tesla Superchargers with a MagicDock are usable by any CCS EV. You can find them on the Tesla charger map by filtering by "Open to other EVs"
