It is a crazy step for GM in particular because it is not like they have any distinct advantages or differentiators as an automaker. Rivian and Tesla have specific niche appeal. I am not sure anyone is clamoring for a Chevy in the same way. Lack of Apple car play is a feature your average user will be aware of and consider when purchasing a new car.
GMs top end vehicles have been plagued with exploding engines recently so to remove CarPlay is a crazy move. I wonder how much additional revenue they expect from pushing ads and their shitty infotainment experience