When you're playing Ark on a server with multiple tribes, some of us are going to run into tribes we're enemies with and others we're friends with. It can be difficult to work together with another tribe when you're constantly worrying about accidently breaking their building or killing their dinos.
Together with a group of friends, we thought of the idea of having affiliate tribes. Tribe leaders and possibly admin could agree to have an affiliation with each other (the affiliation would be created just like people joining a tribe would be created by holding down e and the other person accepting). Being affiliated would mean that your attacks won't hurt the other players, their dinos, or their buildings just like how it works between tribe members. However, unlike tribe members, you wouldn't be able to use their dinos, open locked doors/chests, or build near them. The affiliation could always be ended by tribe leaders and possibly admin via the tribe management page.