Title says it. Discuss. Edit: Irony struck me after posting this, i just got lava greifed on skygrid. Derp. (Lava is cleaned now and situation is fine)
Well, that's terrible. There should be some limitations. Even though sponges are nice n' all you can still get heavily greifed and even worse if they know where your spawn is.
Report skygrid on skyblock. Why it's not there... because it was a new game mode and wasn't added. Griefing is allowed if not protected by sponge.
Skygrid had been out for months, its not exactly 'New'. Besides its easy to pour lava ontop of someones sponge 10-15 blocks higher than its protecting.