I just feel the need to point out that blueprints in unreal are hardly a new thing. You can find microsoft applications for visual programming that look just like blueprints in unreal and there are plenty of other examples of visual node based programming applications out there. Why do you think there are so many garbage apps on every mobile app store? Mobile apps are almost always designed with visual programming it is highly available for mobile specifically.
Charging anything for this is let alone the price asked is a joke though.