I find it strange that people here are fixated with the solving software part. What's really cool to me in the project is the mechanical solution; fitting all the motors, axles, MCU, sensors and battery inside a customized cube.
The solving algorithm is no big deal at this point. Experienced cubers can solve them in under 10 seconds. There are machines that can solve them in < 1s. [1] Again, the innovation there is the accuracy and precision of the machinery involved.
That's a significant time/cost, and typically out of reach for home electronics hobbyists.