I really respect this eyes-open view of degoogling/FOSS-ing. We can do a lot, but some of the all-or-nothing rhetoric on Lemmy is exhausting. Yes, sometimes living in modern society still requires us to use some non-free apps. You've gone far beyond what most people would do in this sort of situation, and even you have reached a point where dealing with other people or necessities of life requires you to have some Play Store apps; so you do what you can to lock them down, but accept that some things are just going to have to be less than ideal for at least a while.