If you'd ever build an artificial "sponge moon" with the goal of assimilating as much spacejunk as possible you'd probably not want to circulate its orbit. But

If you'd ever build an artificial "sponge moon" with the goal of assimilating as much spacejunk as possible you'd probably not want to circulate its orbit. But I doubt you'd ever face that decision, given the absurd materials requirements imposed by orbital collisions.