Saw this long ago and then just came across it again so sharing. It’s called Electron Wheel and is an electric front wheel to put on a regular bike to make it electric. The motor, batteries, controller are all in the wheel. Operates on pedal assist, with the amount of assist set by the app on your phone. https://electronwheel.com/
I have one of these front wheel conversions on a chopper-style bicycle. It’ll slide out under you if you give it too much power in a sharp turn, but otherwise it’s very easy to control.
Worth noting the battery and controller weren’t mounted in the center, only the motor. So a bit different. The extra weight wouldn’t help if I had to guess.