I think this is the wrong perspective. Daimler, BMW, Volkswagen, and others are investing in common charging infrastructure through joint ventures such as Ionity (https://ionity.eu/en/about.html). Ionity is available to all EVs that can charge via CCS (which includes Teslas).
ICE cars can be fueled at any fuel station regardless of their make and model. EVs should also be able to charge at any charging station regardless of the brand.
Tesla says its mission is to "accelerate the advent of sustainable transport". If that's true then when will Tesla convert their fast chargers to CCS and allow all EVs to charge at them?