As Z06TOAMGGT noted above, these our tires are very low profile, providing little cushioning margin when encountering a pothole. Hitting one pothole wrong can easily crack a rim. And why some who live in a part of the country where every major city is in the running for "worst potholes in American" (the cities of the Northeast), buy wheel and tire insurance. Know of one Porsche owner who blew two wheels and tires last year alone, again for hitting just two different potholes, so not just Corvettes, but all who have low profile tires, are much more suspectible to blown tires, cracked wheels and even suspension damage.
Here is a little known fact and a major travesty. About a decade ago when New York City was besieged by citizens clamoring for pothole repairs, as they then had a formal pothole repair program (do not know if they still do), NYC re-defined a pothole to having to be at least 10" in diameter and at least 8" deep, and anything smaller than that would no longer be declared a pothole, but a road irregularity no longer subject to the pothole repair program. Are you blanking kidding me, if a hole in a road is only 9" wide and only 7" deep, it is not a pothole there.
Fortuna, hope your appeal to GM, using sections 13.1 through 13.3 of your Owners Manual gets you a new wheel under warranty, but candidly, think that would be unlikely. (Hope I am wrong.)