I just got finished going around and around with GM for the past 3 months, just to be told today that they wouldn't be offering a dime on the repair because the car was out of bumper to bumper warranty. I have a black 2013 Verano turbo that looks identical to your car. The clear coat has failed, and no amount of car washes contributed to how badly and quickly it failed. These are not simply clear coat "scratches"; this is total cracking and checking of the clear coat that will require repaint to fix.
I opened a case with Buick and had to take my car to the dealer for a quote, which came to around $2600 to repaint just the hood, trunk and roof. The body shop there confirmed that the clear coat had failed on the upward facing surfaces of the car due to the heat and that it wasn't uncommon for other black GM vehicles to have the same problems after 5-6 years. When I asked the shop manager if GM's position was that 6 years was an acceptable amount of time for paint to last on a vehicle, he said yes and that even after the repaint it would likely need to be repainted again in another 5-6 years. "They don't paint cars like they used to" I believe was the quote if I remember correctly.
I will never buy another GM product as long as I live. I currently have three GM cars in my driveway and they will all be my last. I will never recommend a GM vehicle to another living soul on this planet after the way they handled this situation. There is clearly an issue with dark colored Veranos, as I have seen at least two others in town (one smoke gray and the other black) with the same failing paint. The illusion of Buick being a luxury brand is completely tarnished in my eyes when they can't even give it a paint job that lasts longer than 6 years. I have a 1989 S10 pickup in my driveway with paint that looks almost identical to my fully loaded 2013 Buick Verano and that is a complete joke. I only have 56k miles on my Verano and it looks like it has paint from the 90s.