Yikes. Someone definitely shopped at the Depot and then did some shabby work. Pro, was that the before picture, or did you just happen to snap that while there for something else?
I once had a guy tell me it was OK to run PVC for both hot and cold, he had been doing it in all his homes he remodeled. I told him you may be doing it, but that doesn't make it right. Another DIY that knew better.