In case anyone wonders if this is actively beig used, Lion currently powers the internal ING web component library that applies our own design system on top. It is the foundation of the "next generation" web platform for all our web programs internationally. In some countries, it also powers our mobile offering through webviews/Cordova.
Many hundreds of web developers at ING use it for their projects, and all active web development is using powered by it. Lion is a core component of our web strategy. At this time, over 10 million customers are using products built with it, on a daily basis.