As a non-Tesla EV owner, the one supercharger I’ve been to that accepted non-Teslas was out in a rural spot where there was one shop that was closed when I got there.

All the other chargers I’ve been to are stuffed in random parking lots. There’s often something within a 15 minute walk, but that’s completely random. It’s obvious no real attempt was made to cater to charging vehicles.

We’re now starting to get sites with more chargers, and they are being set up as rest stops with food and other services available. But those are still few and far between.

Teal deer; your personal experience is not universal.