The only thing that I don't get is this concept of free Apps ( software) , we don't deserve to be paid for our work as a software developers? and btw, all this "free apps" , all of them, have inside tracking frameworks such a google tracking services, mixpanel , you name it. So in the fantasy world that you are trying to achieve , I dislike as well what big, tech are doing with our data, you would have to create your own Store with strict polices of non tracking , and still you would not be able , because they will track you in their servers, so, unfortunately as you know, the battle is mostly lost.
And open source would not solve anything, we all know that google is tracking us (always) and we go with it, we don't need to read the code, is an open secret.