A curious question: why caring about app privacy when the ecosystem they live in is designed to milk data? We do want only big&powerful being able to eavesdrop privacy but not countless of smaller actors? It might sound sterile polemics but it's not, I'm really curious how techies can talk about privacy on Android, iOS etc. My sole opinion there is just avoid using them.
We don't. And that's why there are efforts to create operating systems that are do not track users. Unfortunately those efforts are not well funded.
Again, we don't want big companies to track us and collect our data, but your questions sounds more like "since big companies collect our data, why should we put an effort to prevent everyone else from doing it?" I apologize if I am misreading what you're saying, but we have to do this one thing since the alternative is available, and once an alternative OS is here, we can switch to it as well.