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the non grounded plugs are usually only used on double isolated devices, like your phone charger.
double isolated basically means all the outputs are only referenced to each other and not to ground, so you won't get a shock by touching a usb plug, where you absolutely would if you touched live wire, where the reference is earth
Funny enough I got shocked by a USB port once because it was "grounded". I have my PC plugged into a fairly beefy power strip, and after getting zapped I figured out that the outlet the power strip plugged into was not grounded. So the power strip acted as a mediocre transformer, putting about 70v through the ground wire my PC was plugged into, then the grounded metal of the USB port.
Surprisingly didn't fry anything in my PC, even that USB port still works just fine. Went through and checked all my outlets were properly grounded after that, thankfully it was just the one I needed to fix.
my pc case shocked me when I touched it, not a huge shock like live wires but enough for you to feel a little pain (like static shock on winter day). My phone charger also shocked me the same way when i touched the metal part of the USB head.
yea PC power supplies do need the earth pin, but i'm surprised the usb also shocked you, maybe a faulty adapter?
It's a $80 GAN charger from Ugreen and the C-to-C cable that came with my iPhone.
I would be a big sad chump if it's a faulty brick. But thanks, I'll find a way to troubleshoot that.