So, I think I found a way to completely cripple Venice AI without any hostile actions. Infact, it's the total opposite. In my current game, I am allied with every CS, DoF with Venice, and I'm sheltering him with a defensive pact(he pays for my armies with his economy) Venice doesn't use it;s MoV;s on the allied CS's. He hasn't touched a CS since I forgot to scoop one up ages ago, literally ages ago. To make up for this, I gave my little buddy a few captured cities.. and he razed them!
This is a diety/large/pangea/10 civ, 24 CS
This is a diety/large/pangea/10 civ, 24 CS