In your car you have an expectation of privacy. Public transport is by definition a public space and thus has no expectation of privacy. Whole different ruleset applies. Anyone can monitor you on a bus. Without your consent too.
Nearly every business has cameras. More and more residential homes have porch cameras pointed at the street. Even if your vehicle isn't monitoring you, it has a license plate hanging off the back so it can be easily identified. We're all being tracked by our phones, and everybody else's phone will be used against you should you be caught acting weird in pubic. There are records of me in more databases than what's even knowable, the plot is so lost. We're back to being naked all the time, except now without the privilege of knowing who is looking at you.
I felt like people rallying against surveillance and tracking were beating a dead horse 20 years ago and I feel even more that way today.
There you said it! But, if you cannot control the software, then it's not your hardware.
Though, I can freely film you from a public area.
Less than some people assume. I've seen people eat boogers while waiting for a green light.
https://link.springer.com/chapter/10.1007/978-3-319-20810-7_...
No doubt many people are aware that card passes are potential trackers, and that may be why a third or so of the ridership pays no fare.