I don't think Tesla's Supercharger Network is pricing for a loss - it's all the cars with established legacy free supercharging for life and the continual expansion costs of the network that push it into a small loss. Tesla will continue to operate the network at or near breakeven while continuing to subsidize the expansion of the network and free Supercharging for life cars with new car sales. Tesla production costs are low enough, relative to the competition, that they can to continue to do this and it doesn't add up to much per vehicle.
Additionally, the new sales do not come with free-Supercharging and are growing so rapidly relative to early sales with free charging, they are quickly neutralizing the negative contribution of those who charge for free.
Competing networks are priced to discourage use. And they still don't seem able to maintain the chargers and keep them functional.
All of this adds up to be a stealth net positive for Tesla. Car reviewers will continue to compare non-Tesla EV's to a Tesla while largely ignoring the differences in charging networks. The consumer, meanwhile, will continue to have a magnetic preference for Tesla's, in part, due to the difference in charging networks. Because many new EV buyers feel their "road trip" freedom is threatened by the move to an EV and Tesla's fast-charging network alleviates that fear so much better than the competing networks.