Fuck me
I checked all of my PS3/4 games (I'm a pleb so i only have 56) using an old iPhone 5's LED flash light. Holding the LED about half an inch from the art side of the disc and spinning it while looking at the data side... Unless what im seeing is something different.. about 98% of my discs have disc rot! Used games. Games bought new and played once. Games bought new, opened but today is the first time even being out of the case. And a few that i just unsealed for this test ... I am kinda shocked. I am super anal about how i handle discs. What im seeing is teeny little shimmery white "specs" about the size of the head of a pin. Some games have a single one. Others have many. They don't look like any of the examples of disc rot i have seen over they years. They seem more "sparkley".. So maybe its just some kind of reflection off the disc art from the way more intense white light of the LED over a household bulb?
Before brushing me off or mocking me about my disaster humidity thread.. two things.
1. Since that thread I've been running a digital thermometer with a humidity read out and its never over 56% in here. Even with my window a few inches open (like always) and its 90% and pouring rain outside. Usually it's under 50%. I was actually kinda shocked. LoL
2. Could you please do a similar test with your phone's LED on a good selection of your PS3/4 discs. I'd like to know what others see.
If this is disc rot i am 100% Going digital only going forward..
EDIT: Looking around a bit.. Seems this might be pretty common for Bluray games. Its called "label rot" and from what little i've found it may not affect the data of bluray games.

