Closed source software can't be audited, so it can't be secure. If software isn't secure, the exploits rid it of any privacy.
See: The bimonthly remote takeover bugs that keep getting found. Like this one: https://citizenlab.ca/2023/09/blastpass-nso-group-iphone-zero-click-zero-day-exploit-captured-in-the-wild/
"Oh whoopsy doopsy, looks like your iPhone, camera, files, GPS and more were accessible to someone who sent you an iMessage.. for the third time this year"