This is kinda old information, but my understanding was that there were 3 issues with dasiy-chained UPSes.
The first is that you’re potentially going to cause a ground loop, which is not healthy for the life of anything plugged into those UPSes.
The second is that there’s a potential for a voltage droop going through from the first to second UPS, which means the UPSes will flap constantly and screw their batteries up, though I’d be shocked if that was necessarily still true for modern high-quality units.
And of course, the UPS itself won’t be outputting a proper sinewave when it’s on battery, which means your 2nd UPS in the chain will freak out (though again, maybe modern ones don’t have that limitation).
I assume the KDE implementation resizes to default when you stop shaking it.
I could totally see someone coding a function that increases the mouse pointer by x% every y mouse shakes, and then neglecting to put in a size cap.