sponges

Hello, I would like to know how does the sponge permission works. If i give someone permission in my region, will the person be able to destroy my sponge? Also, will this person be able to use the sponge commands? Like adding someone new in the region, or hide the sponge. Thank you!

So Every Time I Made A House With Sponges And I Leave For A Few Months They're Gone And Most Times Someone Raided My House Because I Have No Sponge. Do Sponges Expire Or Something? Because They Always Disappear.

So... I had three sponges protecting my house. Logged on today to find that its been raided, all of my chests... everything. I spent real $$ on some spawners as a gift to my house partner. Any suggestions?