this is crazy or whatever i guess but your phone is a living breathing data collecting MACHINE until you get a custom OS. Graphene, Lineage, etc.
Google and other software runs as a root context in these stock operating systems, so it can see and do whatever it wants on all possible levels, even scanning your screen and keylogging your typing. if you collecting things about your Nekogram was bad? think again lol. there's much worse.
go study about how the OS works. then get a custom rom.