Keyboards are generally known about, but the ergo part of it is a rabbit hole within the rabbit hole. Some people literally design, 3D print, wire up, solder and program one-off keyboards because they don’t like the ones made by other people.

It meant getting root access to the device, which means you can do anything you want. People would get apps for free, install ones that aren’t on the app store and customize their home screen in ways that Apple doesn’t allow (like placing apps where you want). It’s still IOS, just with the ability to screw around under the hood.

For Android, rooting is pretty much the same thing and it’s still common.