It's used for a "Group radio" mode, it's create radio track playing group's songs randomly. Useful for exploring group's music. Actually this can be reached by adding group to bookmarks and creating additional shuffled playlist. But it's need less actions, don't need creating playlist and integrated with global search. And I'm not sure what to decide: improve it by adding "Listen radio" action into group/user search dialog and bookmarks or totally remove this feature.