I have used samseng oled screen such as s2, note 4, note 8, a52, all never ever had any green line/screen issue. I also have used others oled screen phones such as oneplus 1,op 7t, pixel 1, pixel 3a, pixel 6a, xiaomi (cant remember which model), realme 9 pro plus, rog phone 6D and etc since i change and buy phone quite frequently every year but back to to point, almost all the phone i still kept till this day, or give to relative and still serviceable till this day too. none of these had any screen burn/green line etc. so i think the damage related to user behavior. Btw i always crank up my display to the brightest as i often work under the sun.