I interviewed the creator of PaintChainer Daisuke Okanohara for my podcast Disrupting Japan.
https://www.disruptingjapan.com/
That episode wont be out for a few weeks, but PaintChainer was developed as a kind of proof-of-concept for Chainer, their open source AI and distributed deep learning library.
Everyone thought it was cool, so they made it widely available, but its not intended to be a real product or business.
There is a lot of cool stuff happening in Japan right now.