if you had asked well, you could've thought about it yourself aswell tbh. People shouldn't rush into things blindly as much
The theme was intentionally set up this way, on first glance i think a lot of people will think "shit, can't build any steampunk or nordic" and move on to a different theme. The people who get really stuck though, they'll try and seek confirmation whether something is allowed. So technically, it is a "build whatever", but in practice most people won't do this, they'll go out of their comfort zone and build something fresh and exciting