As someone who uses free software and worked closely with some mobile privacy-related projects, it's headscrambling to see iPhone users talking about privacy. I won't use it; you're free to do so, but when it comes to your privacy, it's just a delusion. At least be aware of what you've got - no security and privacy is way better than a false sense of it.
NSA likely exploited the SSL vulnerability in iOS 6.0 (released Sept 2012, NSA added Apple Oct 2012) and got access to snoop on Apple's data.
After pulling the phrase "participate knowingly" out of thin air, Washington Post was forced to walk back that statement:
"Hours after the news broke, and every company bar PalTalk and AOL denied any knowledge of the program and allegations of their involvement, the Post has changed its stance. The phrase “participate knowingly” has been removed from the article, a new passage suggests the firms were unaware of PRISM"
https://thenextweb.com/us/2013/06/07/wapost-backtracks-on-cl...
Are you really suggesting that prior to Sept 2012 there were no critical zero-day vulnerabilities to which the NSA had access? Surely by your reasoning, Apple should have been included in PRISM years prior. And yet, it wasn't until after Steve Jobs died that Apple began to participate.