Ive had no issues and the unit has been on a round the world trip with me.
To me the photos look like a typical ribbon cable connection problem, have people tried to reseat it?
Have people been playing with full brightness?
I've re-seated the ribbon cable, no change.
Tried different micro-SD cards, no change.
They just shipped one with a bad screen and now no longer reply to my emails about it after sending me a cheap, unbranded micro-SD that doesn't even work - the unit won't even boot with it.
Done with Anbernic, done with retromimi, done with Chinesium handhelds, period, because they perform absolutely no QA/QC on anything.
The factory makes it, boxes it up, ships it directly to the user who ordered one.
Any emails or website proclaiming that they "inspect" or "test" them prior to shipping is lying in order to cover a possible manufacturing delay.
Sure, you might get one that will last but the odds are against it lasting a long time.
Certainly not as long as my GCW-Zero has lasted, definitely not as long as a PS Vita.