Mouse Jiggler

Mouse jiggler v2 2 Hours | Mouse Mover/Jiggler
How To Thamizha
The Unwanted Blog explains:

Short form: if you work remotely using a company-supplied computer, chances are that the computer has “bossware” installed that tracks mouse/cursor movement to make sure you’re at the computer and on the job. So if you get up to take a leak or answer the door, your employers will know in a few seconds that you’re not moving the mouse anymore, and you could get in trouble.

Never fear: the free market is here to help with any number of “mouse jigglers” that will give the *appearance* to bossware that your mouse is being constantly manipulated. Some of these are bits of USB hardware. Some are software. Some are actual mechanical devices. My favorite, though, are simply YouTube videos: play the video on a phone or tablet and place an optical mouse on it; the moving lines spoof the mouses optical sensor into thinking it’s being moved.

Update next morning. I tried a couple of these videos and I couldn't get them to work with either my desktop display or my Android smartphone. Still a very cool idea.