We'll see. I for one believe opening up the network will lure more customers into the Tesla fold. At the moment though, Tesla's bottleneck is still ramping up production, not landing new orders.

In the US Tesla are the waste majority of EV, and those that are not Tesla usually can't charge anywhere close to fast enough for it to be reasonable to charge at a Supercharger.

The markets are just totally different. In the EU there are lots of cars that could use the Superchargers so you can make way more money there then in the US.

They always said eventually they would open it up to everybody. Its a balance between it being a selling point and making money from higher utilization.

It's not a good control since there are other differences between US and EU, most notably charging connectors standards and chargers per cars (US superchargers are more crowded than EU on average).