Custom game matchmaking idea

I think 343 should add a custom game multiplayer. Lets say you don’t have that many friends on XBL and you have a nice map you have and want other people from around the world to play on it. They should make it were like in a forum you can post a map on the game type and then with a big data bank of maps, they are chosen at random so you can play on them. What do you think?