I think you misunderstood. he meant in Germany the gfci is wired between where the electricity comes into your home and the breakers, so every outlet is protected, not just the ones in the bathroom.
Except in old buildings, like the one i’m living in, where there is no grounding wire and ground fault protection is done by bridging ground to neutral and hoping that enough current flows through the fault to trigger the breaker.
People who build their own PC and want to use an OS that they are familiar with. Especially when you want to game, windows is just easier than any free os and you can get a legit key for 20-30 bucks, while pirating windows has become a lot more complicated since XP.