This is really cool, but $33 for a single generated world makes it hard to see this being useful for games just yet. Not to mention how this would go in a much larger project
There are free open source tools that convert osm data into 3D models, for example https://osm2world.org/. Also you could use freely available national 3d point cloud data, at least for some areas. both are $0 options. btw I am not saying $33 dollars here is expensive; just giving you some comparisons