That's a very misleading statement. I am NOT saying you, GerKNG are trying to mislead or deceive anyone - only that the, oft repeated statement does.
My 55" LG OLED TV is over 7 years old. No burn-in issues. Why? Because, while my TV is on 5 - 6 hours a day, I don't display the same image on it for hours and hours, day after day, week after week and so on. Plus, the TV itself has burn-in mitigation features to prevent such problems. For example, it can sense when a logo (like CNN) is being displayed in the corner, hours on end and will ever-so-slightly move it about so the same pixel is not lit up with the same image all the time.
The newest OLED screens on TVs are even less susceptible and have even better mitigation features. OLED monitors follow suit.
This is another one of those "rumors?" "myths?" "misconceptions?" that go WAY BACK to the beginning of time, that
might have been based on truth "at the time", but are no longer. It is just like saying your SSD is going to wear out because is has some write limit that will affect you. Yes, that was a problem with "some"
first generation SSDs in "some" scenarios. But it is total nonsense with these devices today that have evolved well pass the first or second generation.
Burn-in issues are a MUCH BIGGER problem when the display is used, for example, at airports where arrival and departure information is displayed 24/7. Or in POS (point of sale) computers (like grocery store cash registers). They are not an issue when the image is constantly changing like it does with "normal" TV and "normal" computer content where the image is constantly changing between Windows, your browser, your game, and back again.
OLED screens have been used on cell phones for many many years. Do you see millions of complaints about burn-in with cell phones? Nope.
So to say it is a matter of time is misleading - unless you display the exact same image (or parts of the exact same image in the same spot), 24/7/365.
So,
@Kminek - if you are shopping for new monitor, pay attention to its performance specs, size, stand features (mine MUST have height adjust), and price. Do NOT let some archaic issue with ancient OLED monitors dissuade you from purchasing a monitor that otherwise meets all your needs just because it happens to be OLED - especially when the image OLED provides can be so rewarding/gorgeous/beautiful/realistic (do I need to go on?).