@The-Nastiest
There has been a vast number of improvement over the years and brought up and listed. The largest improvements were from the initial launch in 2016 through 2019 (LG B6 through the LG C9). I haven't seen much explicitly called out to assist with burn-in other than the auto-dimming functionality if it detects static-ish content. I'm not even sure if having a heatsink on the panel like the top-ends now have is to help with burn-in or just allow for higher overshoots to hit brighter brights.
However, all those OLED sets are mostly aimed at entertainment use and not Desktop / PC Monitors.
Here's what was initially said about the 2016 through 2019 OLED burn-in improvements (latest repost of the info I could find):
Regarding oled burn in. Is it something that can be stopped just before it happens. What I mean is, the static content that would have caused it never gets displayed again. So if you can't see the burn it yet, your ok? Or has the panel degraded enough by a certain point that the image will be...
forum.beyond3d.com