I hate zoo keepers as well but, if they are only lowering the fps, and is not giant, or scathered around abusing land claim, may its not a reasonable reason for a disciplinary action. Every base i aprouch lowers my fps do 10-20 because i have a very humble hardware, and as FC told in the discussion regards ToS the size of the base is no much relevant since its not abusive and the area is functional and not decorative, not covering resources, or blocking content. Regarding the foundation spam you are right, regarding the rendering issues it is subjective. As you brought it to community eyes some screen shots with no names would throw light over the matter.

I the past i was reported by a white knight now this same guy has a bigger base with various satellite builds he puts around to people not build near him. And is not an active player anymore just a refresher.