I prefer to call it a 'mechanical failsafe'.

but that's a very consensual action, they literally have to ask you for those information not just start harvesting in the background

Our buses have an aux input jack. I just don't ever feel like messing around with an aux cable and USB-C adapter just for 15 minutes of music. Although i would really enjoy making my elementary school kids listen to Shpongle.

Not a bus driver but I've seen enough of them to answer this question.

When they aren't driving the bus, they are either waiting for kids to get on or off the bus or they are briefly investigating who threw the stray projectile that hit them before they pulled over but usually settle for the complete silence as each kid pretends to not remember what throwing even is, let alone admit who threw anything. That silence never lasts more than a minute after they start driving again, though sometimes it will only be whispers for a while if the bus driver screamed in rage or broke down in tears.

When I was 19 I was in a band with this really strange kid. He was super charismatic though, and just seemed to make friends with anybody he met. One of those people happened to be this 40 year old bus driver. We went over his place one time to smoke a joint, and he showed us his grow room. This was in like 2005 or so, so all very illegal. He got in my face about not telling anybody and how I better not be a narc. Anyway... Then we ate some pot brownies and watched a movie. The brownie I ate wasn't doing anything so I ate another and learned a very important life lesson about edibles. If you're not feeling the first one, don't eat the second one. I was high as fuck. Banished to the shadow realm, some might say. Took a few hours to regain my composure and walked home. It was a weird fuckin night.

So yeah. Probably anecdotal but "what do school bus drivers do when not driving a school bus?" - grow weed, and eat pot brownies with teenage punk rockers and watch movies.

Ride my bicycle. I'm a retired software engineer.