Chromecast works in my EV for every other streaming app, so the licensing seems to be a solved problem for them. Netflix, however, never worked and my EV manufacturer had to release a support page specifically for Netflix not working.
I suspect this is just more account security. I remember paying $20/mo for a premium plan with a set number of screens on the contract…but one day their side changed and those screens had to be on my WiFi. I was no longer paying per screen. I was now paying per-household, but I never agreed to that change.
I cancelled Netflix after 15 years (DVD era) and have never looked back. Just hostile decision after hostile decision.