Comment by pastk

Making map generator proprietary won't help to solve "freeloaders hogging onto their map CDN" issue. In fact, it actually forces potential forks to use their CDN because they can't setup their own map generation (as its closed source).

The OM's map generator was made proprietary in order to hinder the right to fork and enforce vendor lock-in. Later, a proprietary "Data License" had been introduced for binary files (incl. maps) with the same goal - effectively one can't build/fork OM without these files anymore.