The creator gave a talk that has more details on how it was done: https://www.youtube.com/watch?v=gfODe92DzLU https://www.youtube.com/watch?v=gfODe92DzLU IIRC

The creator gave a talk that has more details on how it was done: https://www.youtube.com/watch?v=gfODe92DzLU https://www.youtube.com/watch?v=gfODe92DzLU IIRC he found a way to download streetview images without paying, and used the OCR built-in to macOS (which is really good).