Predict what your players will do. In all games, we can model based what makes your customers leave in your specific game. In an adventure game, we can predict participation in an event/challenge based on previous event performances. This can help optimize event difficulty. In first-person shooter games, we can see which maps are so bad that they are losing people. In a territory game, we can predict when your potential big spenders are being pushed out (and could use some love).
SaaS Platforms and Home-Grown IT Systems:
Help predict user behavior based on user behavior. SaaS Platforms can have a live table that predicts when people are going to quit. From there, you could build some canned solution to try to mitigate this.