They always have, these just happened to slip through the net. If it were a real effort by Apple they would have all been done simultaneously. Blockchain.info evaded the reviewers by presenting them with a version of the app that did not allow spending (allowed) and then changing the server behind it to re-enable the sending features. This is certainly breaking the rules, which is why they didn't update their app again- they knew it wouldn't work a second time.
If it was a systematic ban, there wouldn't be some left — https://itunes.apple.com/au/app/coinjar-for-iphone/id7252098...
> Sadly, Coinbase, Gliph, and CoinJar have all been sacrificed on the altar of innovation.
Interestingly enough, nobody bothered to check this before putting it in their blog post.