Test Track is obviously a Chevy advertisement, but Chevy is not "the IP" of Test Track in the same way that, say, Frozen is the IP of the ride formerly known as Maelstrom. No one rides Test Track because it's "presented by Chevrolet". They ride it for the thrill of going slightly slower than I drive through a school zone.
But yeah, of course Disney is more willing to build attractions that don't have their own IP shoved in them if someone else is footing the bill. Wish it weren't that way, though.