Awh, Can you give a idea of how much nuisance such devices can cause you daily? Also is there a way to prevent cochlear implants from detecting these frequencies? (like do only some cochlear implants do this or most of them do)

I really wanna use tech like this sometimes in future, but I also wanna care about accessiblity.

I also have a cochlear implant; it doesn't allow me to hear ultrasonic frequencies -- in fact, my hearing range is still a subset of "normal."

I have one as well, and I've noticed that area proximity detectors (in hallways used to detect presence/motion) do get picked up and come through as loud pops.

There are also electricity poles with a strong EM field that cause a humming sound.

How loud? These are audible to me without an implant (unless some are audible and some are inaudible)

You might be hearing a relay, which is itself switched by the proximity sensor.