The chargers are not proprietary either. That's kinda the point of the switch to NACS. Home chargers have always worked with J1772 vehicles with a simple adapter. Superchargers are slowly being made available to all vehicles.
In other news, Apple is now using using USB-C. These may or may not be related.
Not at all related. Apple was forced by the EU. Tesla, I'm not really sure why they suddenly decided to open it but there is another OEM that was already using NACS connectors in their prototypes (before NACS was a thing) and they organized a change.org petition to open it that received around 44k signatures 4 months prior. That is my best guess.