See it a different way: It is a joy for you, me and other players if user created structures are in the game. The possibilities and varity is endless and make the exploring really interesting.
As example if one or two of your structures are in the game beside many others from other users, there is always something to discover because there are more than enough people who want to implement their structures in a game. The quality would be high because I know many structures from players and the varity also, because Red couldnt create so many different structures because it is very much work.
It is only a win win situation, for the creators, the players and the developers. Especially the new players would like the varity of the points of interest to discover. If the game gets bigger, it is also better for the developer and this is better for us, the players.
Also it is very motivating to build good buildings that the votes in the forum gets high. Maybe every two weeks new structures are implemented with the best voting or just Reds opinion. Not size matters, it only should create a varity. As example only some pillars and bricks could make the difference. Or an small artifical cave. Or a small abandonend camp with a fire pit and some food you can find there. Or a old ruin, parts of a stone wall, some megaliths. a.s.o. But also a huge manson and fortress can be interesting to find and explore.