Assuming an OS or software is granting privacy is naive at the best and dangerous at the worst
Discussion
It's giving you the assurity that your screen isn't recorded, photos are not getting analyzed and voice is not being recorded without your explicit permission, at least at the software level, it is an assurance you can never have with a closedOS.
Not wanting this, is defeatism.
"why open source software is important"
by ABH
It takes some courage to accept the facts, build one’s strategy, and stop making believe. Maybe some, assuming certain surveillance, can focus in the real privacy.
On the other hand maybe tor or encryption for everything is remarking some evidence suitable to investigate. Maybe some software is just a honeypot, like many of the VPN services.