What is the fine-grained topic of the following text: “The LEGO Group today announced that it will close LEGO Universe, an MMOG (massively-multiplayer online game) that has been in operation since the autumn of 2010 In spite of very positive player feedback and a large number of players in the free play zone, it has not been possible to convert a satisfactory number of players to paying subscribers. Only return the topic.
Closure of the LEGO Universe MMOG due to insufficient paying subscribers.