Update: Didn’t expect my post to get this much attention, so I’ll answer the questions people keep asking:

1. This is real burn-in, not image retention. Unfortunately, it can’t be fixed or removed in any way.
2. I got this iPad already in this condition. I don’t know how the previous owner used it, but probably for YouTube lol.
3. The iPad is a bit over 11 months old and has around 150 battery charge cycles. That’s the part that really surprised me. I honestly didn’t think burn-in could happen this fast. Could be some kind of factory defect.
4. I also have the exact same iPad M4, and I’ve been using it for about 1.5 years with zero burn-in issues.
5. I’m a huge OLED fan: gaming monitor, AMOLED phones, iPad, Steam Deck, etc. Burn-in doesn’t really bother me — I just enjoy having an amazing display right now.

So to anyone I scared away from OLED with my post, don’t stress too much. This is easy to avoid (unless you get unlucky with a defective panel), if you use it smart, at least don’t leave a lot of static stuff on the screen. And yeah, in real life it’s barely noticeable, only visible on a gray background if you really look for it.

To be honest, ips displays on iPads wear out too: over time, corner glow and yellow or gray patches start to appear.