Trust me I have seen hundreds of monitors that were burned so bad the
software main menus was clearly legible with the monitors disconnected.

I've seen this type of burn-in many times on CRT monitors used in POS systems.

Me too, particularly login screens
and anything with text in the same place for a long time
such as airport and train displays.

VFD (Vacuum Fluorescent Displays) suffer burn-in too.
I took some photos: ferretronix.com/tech/vfd

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