I've use a 48 inch LG OLED as a monitor for about two years now.
It's set in PC mode and except for the occasional time I hit the wrong button on the remote, I completely forget it's a Smart TV.
I did connect it to the wifi once to update the firmware. Note that it also took a lot of fiddling with I first got it to get a decent picture setup - although part of that was finding out that I needed a fancy HDMI cable to get 4k@120hz, and another part was figuring out that HDR isn't really viable for daily PC usage (turning on HDR makes the picture darker, because although the dynamic range has gone up, the max brightness of OLED is not that high so it has to make things dimmer for the dynamic range to be available. Plus Windows HDR management sucks). Oh and the gloss finish means it's not suitable for bright environments. But otherwise it's a beautiful screen and would be an awesome TV too with wifi turned off and connected to a TV dongle of some kind.
I did connect it to the wifi once to update the firmware. Note that it also took a lot of fiddling with I first got it to get a decent picture setup - although part of that was finding out that I needed a fancy HDMI cable to get 4k@120hz, and another part was figuring out that HDR isn't really viable for daily PC usage (turning on HDR makes the picture darker, because although the dynamic range has gone up, the max brightness of OLED is not that high so it has to make things dimmer for the dynamic range to be available. Plus Windows HDR management sucks). Oh and the gloss finish means it's not suitable for bright environments. But otherwise it's a beautiful screen and would be an awesome TV too with wifi turned off and connected to a TV dongle of some kind.