I read feminist engineering and phones and trust and just have to mention that the Bloody Health Collective that I am a part of has built a FOSS cycle tracking app that doesn't collect any data (other than on your phone). For anyone reading this who might be interested in that kind of thing.
we've held a bunch of first-time contributors' workshops and for a lot of people there, the notion that they can actually build the apps on their phones themselves, or modify them, was pretty radical. I think that's part of the equation too, showing people that they don't have to be passive consumers of technology. Getting more, and different people involved in building things.