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Tesla has always been open to this - but so far no other manufacturer has wanted to admit that they need the network. "Buy our EV and you'll have access to the Tesla network" probably doesn't work well for brand protection.
Your link goes to another site.
Would be relatively easy to Tesla to brand some of their Supercharger stalls for other manufacturers.
First you need to make a long range EV, and then you can start using these high powered chargers.
Except Bolt, there is none out there... so all this talk of sharing of superchargers is all moot and premature.