The potato plant is a nightshade, closely related to the tomato. All nightshades contain poisonous alkaloids, including small amounts in tomato fruits and green potato skins.

The potato is still a vegetable though… Vegetable is a culinary term and can apply to any part of a plant, including roots and tubers.

I’ve never heard of Macs running embedded systems - I think that would be a pretty crazy waste of money - but Mac OS Server was a thing for years. My college campus was all Mac in the G4 iMac days, running MacOS Server to administer the network. As far as I understand it was really solid and capable, but I guess it didn’t really fit Apples focus as their market moved from industry professionals to consumers, and they killed it.