I came across this research, which I find rather depressing:
https://www.scss.tcd.ie/doug.leith/apple_google.pdf
I guess that is the gamble privacy enthusiasts take? “Just do as we say, and you will be safe”. Is the message from the manufacturers. Then we find that we have swapped safety for autonomy and suddenly the amazingly useful device we paid good money for (whether it be either of the only two alternatives iOS or android) is gathering information about us, that we don’t want gathered.