If they collaborated today that would mean a lot of active coordination required. And only municipalities in the collaboration can benefit. If they just open so

If they collaborated today that would mean a lot of active coordination required. And only municipalities in the collaboration can benefit. If they just open sourced what they have this collaboration could grow more organically. Of course large scale software collaboration isn't impossible without open source. But my impression is that it greatly simplifies it. Besides, if the software is open source, other non public actors can also benefit from it.