Not really true in newer models. The Tesla charger was adopted as the North American Charging System (NACS.) Pretty much every new EV made in the last 2 years uses it, and all of them will moving forward.
It was only very recently that other car brands started adopting Tesla's ports. Probably most non-Tesla EVs won't be found at a Tesla charging station.
With that said, is it really that uncommon for EV owners to not have a charger at home?