MacOS assumes you won’t full screen every app because all of them ship with large enough, high enough resolution monitors that full screening a single app is a waste of valuable space. Unlike on cheap laptops with 1080p screens.
I suppose you could splurge for a Mac desktop and then get the cheapest, smallest screen possible, but I hope it’s rare.
Any properly grounded device will do that with specifically incorrect electrical wiring and/or a shoddy charger. Did this happen with a properly wired outlet, and an undamaged Apple charger?
I have doubts that it did, as that would warrant a safety recall.
That’s what I’m personally banking on. I think anyone with the resources to bypass these would first just use a rubber hose.