They do. They build immigrant TC then train immigrant villagers and build immigrant houses (to get more XP). I intentionally made them ignore immigrant military because, well, human players would kill them all in just few seconds if they decided to use them attack/defend *shrug*. Villagers and houses could stay longer in the game since they stay at base, unless those villagers are unlucky enough and get caught by enemy military far away from their town
Actually, making that change is easy *shrug*. Easy but tedious. I can make them get military if people claim.