It’s analogous to a TV and monitor manufacturer saying they are no longer providing non-wifi inputs, app side loading, or supporting screen casting from local devices.
Then the manufacturer would charge a monthly fee for the monitor to keep working.
Hopefully, next, the CEO acts surprised when reporting the resulting massive drop in shipments.
For me, there is no room for GM to become a player here. I have friends' addresses, etc. in my iPhone's contacts and they show up on Maps. GM isn't going to do that, so GM isn't going to get my business. I'm starting to look for a new car right now, and this is a hard no. If it doesn't support CarPlay and Android Auto (both--I've used both in the last five years, and might switch back again to Android in the lifetime of my next car), it's outside my observable universe.