I could also see push notifications about adding bleach tablets or whatever to it periodically if that's your thing. I have a smart fridge (probably the dumbest smart fridge you can get feature wise, doesn't do much). I can check and adjust the temperature from my phone and get filter replacement reminders. It can send push notifications if the door isn't shut which would be more useful if I had kids. Just because you don't think you'd have uses for it doesn't mean it can't be useful.

Again, with the huge caveat that the toilet be capable of manually flushing.