>>Sorry to write this, but very few of the members here belong to any of the mobile app target market.
OK, but I'm expecting that people here (and your customer base) may well be working on invoicing or similar mobile apps where privacy still counts.
I had a weird experience this week. Last year I thought I removed all traces of account details from my Android phone and moved email to K-9, to avoid all the usual gathering and matching. Then this week I got a message in the disused/disconnected Messenger app saying some strange person had logged on using my account in New Zealand and was it me.
Of course it was... but how did they direct a message for that account to this anonymous phone? Turns out that Google retained a Google Play login that it hooked to Messenger even though Messenger has no associated account and Google Play wasn't in use.
Seems these OS vendors are very determined and speak with forked tongue... ;-)
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
