But tbh I think the risk to reward ratio wouldn't be worth it for a bit still (at least until electronics get a bit more user friendly)

You'd have to be capable enough to be able to fuck around with microelectronics (which a convinced enough hobbiest could do), horny enough to put a large amount of that effort solely to being horny (even when youre smucking around in the stinky toilet electronics), confident enough to know you electronics will truely be undetectable (or just dumb/rich enough - though with greater risk), a bit sociopathic to not care about peoples privacy at all, and finally own a public enough place you can implement all this.

I feel like that's a reasonably small subset of people, so personally I'm willing to risk them catching a low res video of my shitty asshole.

That being said I dont want to discredit youre theory, just give my take on it