Earlier quoted context omitted.
Whilen I entirely agree with your point, I don't think that a comparison between the Apple and Twitter is suitable. One is a company that publishes an operating system, which is locked down and requires software installation through their Monopoly App Store ( which I find highly distasteful), the other one is a web-based social media thing. iOS as a product is in no way similar to twitter.
It's the same thing. iOS is controlled by Apple. Twitter's API is controlled by Twitter. Both invite developers to develop on their platform so they can reap the benefit of increased user functionality.
If my operating system has a rootkit or APT I am boned. If twitter is hacked I couldn't give a fuck, it doesn't affect my equipment or how I use my computers.