we should be concerned about all invasions of privacy, but your phone's camera can't be remotely activated without first infecting the device and the wifi tracking within a home is a targeted attack and not one that fits most people's threat models. do what is best for you and learn more about the threats from which you wish to protect yourself.
Discussion
My understanding is the French feds had no issue simply enacting a law that allowed them to remotely activate microphones and cameras. Whether that means they always had the capacity or need to hijack devices with zero days/backdoors I can't be sure but it wouldn't surprise me in the slightest if they simply had remote access handed to them on a plate.
We desperately need open source, open hardware phones with something like graphene os. Otherwise I think it's safe to assume the feds have root access to all devices.
"Otherwise I think it's safe to assume the feds have root access to all devices. "
i think it's over the top to assume this, but everyone should do as they please.