Well naturally non-spherical mass would not come to existence due to the way they are formed, which then the components will become connected. However, should other shape be formed (by unnatural means), it will stay that way. And what is your point about spinning exactly since they actually get rid of mass but counteracted by both molecular bounds and gravity, though in a circular, but also spherical manner instead of egg due to earth being a spherical planet. And let's not forget that earth is at peak density and cannot shrink further at current state nor will it implode any day.