Stefan is 100% correct. I have said the same thing before about the servers getting uploaded and then getting entirely rebuilt before but people just said I was whining.
Andor is a good example of this, but I'm not sure since I heard they stopped making a new world and focused on the one they had. Basically they get online with a small world, then wanted to make a new big one right afterwards.
Faheria did the same thing, although they are UC, it's still online and they got accepted due to what they had I guess, and now they are redoing it. Although I guess they are making it better.
I don't really see the reason to have public UC servers.. players are going to get on, see barely anything, get bored and start forming opinions about the server before it's even released. Plus staff get bothered, and like with 2k2, it will surely be reset when the server officially goes online, which means a ton of people will be mad that they have to lose all the stuff they worked for while it was UC.