

I’ve generally heard the origin explained as coming from an offshoot of the general scifi community in the late 70s to early 80. There are a lot of animal people in sci fi (things like aliens designed after animal people, or stories about animals given human traits and characteristics, or people being spliced with animal dna), and fantasy stuff which has a related audience, and some people particularly liked that trope.
Even there though, what is the actual point of a phone app controlled smart toilet, even if you open sourced the whole thing? Unlocking one’s phone and tapping the app icon, and then presumably a button on the app, is going to take more time than one press of a lever that one is right next to anyway, and the latter doesn’t present as many points of failure.