From anecdotal evidence, it seems that Android users use the cloud a lot less than Apple users. By default, Apple users will have every piece of data on Apple's servers unencrypted (with unencrypted iCloud backups, and all files from Desktop/Documents uploaded to Drive). Apple puts it all on a nice, single screen that makes anyone with OCD want to turn every button "On" and send all their data over; and they're all turned on by default anyway. I don't have hard evidence for this, but I believe most Android people just don't end up turning that stuff on; many don't have backups, don't have all documents and Chrome downloads stored in the cloud by default, so they likely experience a lot more privacy by default. Again, all anecdote, but I think you'll find the same is true for your friends circles.