Laser Rot was common is early CDs and Laserdiscs. I do not know what caused it, but it does not seem to occur much if at all anymore. I would not be surprised (speculation) if there is a possibility of Laser Rot eventually with CDRs, considering how they are made (on your PC).
I still have a couple old CDs and Laserdiscs with Laser Rot. They laserdiscs have snow like a bad TV picture and sometimes dirty sound. The CDs have background noise like a dirty LP or that background noise heard on old 78 RPM records.