Couldn't agree more, but I'm just highlighting it seems like a much more profitable and attainable commercial goal for them in the short term than trying to enter the vehicle manufacturing space as a competitor. The fact there's an awesome open source project tackling this idea already (thanks for the link - I didn't know this existed!) says it's viable.
They've already dipped their toes in with Car Play/Android Auto and have the relationships with third party vehicle manufacturers, so this seems like a logical next step. Perhaps that's what they're actually doing by shifting their car team to AI.