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They say Groupon's Gnome is an operating system, do you know any details of how they built it? Is it Linux based, etc?

It seems to be based on iOS.

Wait what? They built an 'iOS based operating system'? I don't understand how that would be possible?

Probably just iOS with a full screen app that's started by default and some changes in the default settings.

¿Apple lets you do that? Seems quite against their usual policies of "My device, my user experience".