I haven’t yet, I have used the film on glass for my first mirror project. The main problem is you have to use soapy water (spray) to apply the film to make sure you don’t get any bubbles. (Near impossible to apply film without water)
If you do this directly to a typical monitor screen you might get water over the electronics side of it. You might be able to if you’re extremely careful and take good precautions.
I’m planning on trying this on my next project as I have a touchscreen monitor.
The monitor I have is a frame-less one and the glass is a bit thicker on the front than a typical monitor.
I am confident I can apply the film to this without any issues.