I think "Trust" is used in a weird context here.. "Why Apple Doesn't Rely on Developers" might be a more accurate title.
He's saying that Apple doesn't sit around waiting for developers to create compelling apps for their products, not that developers are "untrustworthy."
Apple seems determined to avoid depending on Photoshop and Final Cut Pro to sell hardware, to the point of curbing software offerings that might become the reason to own an Apple device.
They don't simply believe that "you can't count on third-party software to sell your device." They believe "if you let third-party software sell your device, you have made a deal with the devil that you will regret."
Nintendo might be the same way, which is why the own so many of the big title characters for their machines. Sony and Microsoft picked up on this, and own their own franchises as well.
He's saying that Apple doesn't sit around waiting for developers to create compelling apps for their products, not that developers are "untrustworthy."
To me those have different connotations.