Sometimes they fight over food (automated feeder) and one doesn't get fed. But it's hard to tell if they're meowing at us because they were bullied out of food, or because they know we are softies and will feed them if they meow enough. We can check the feeder footage and see who got fed.
One of them is potty-shy, and about once every 3-6 months stops using the litter box and starts using obscure corners of the basement until we can coax him back to using the litter box. We check the footage every couple days to make sure he's using litter boxes.
For a software-oriented site, I'm baffled at how obtuse users can be. A lot of the negativity I'm seeing is along the lines of "I have no use for an indoor camera, therefor anyone who uses them is dumb." There are lots of legit uses (if you think about it for more than 2 seconds), and not all of us want provide the police with indoor footage of our cats shitting.