It appears that LittleBigPlanet moderation has been incredibly aggressive, with some levels being removed from LBP servers completely -- without warning, and without reason. Creators, who have spent hours on building levels, don't have access to any backups when their levels are deleted off the face of the internet. Obviously, the sudden deletion of their levels have them quite peeved.
Many of the levels in question involve copyrighted content. For example, levels based on Nintendo's Super Mario Bros. series may be wiped out. Even levels based on Sony's own God of War have been removed. While we understand Sony's need to ensure proper moderation against copyrighted material (they don't want to be sued, of course), this is the wrong way to approach it.