[divtxt]

I'd say it's intentional due to Hanlon's razor in upper management.

Perhaps some logic like this: we can't lose "our" BBM users but blocking IM apps would drive users and developers away. Let's quietly block IM apps at the approval stage!

Also, "anti-competitive" is the wrong description - unless you count killing your own company. :D

[akc]

I can corroborate with the author's story. I'm developing the BB app for a cross-platform group messaging app and I've also hit a wall of silence from RIM. I can confirm that they are deliberately not giving us access to certain parts of RIM's infrastructure that would make things a lot easier for us. Oh well, guess we'll have to engineer our way around those roadblocks and then open source it!

[divtxt]

I'd love to hear your history, reasons and current attitude to developing BB apps.

The stories* tell me that the RIM/BB developer experience is so much worse than iOS and Android that it's not worth bothering with (as developers and hence as a viable platform).

* the big ones: http://news.ycombinator.com/item?id=2263882 ("You Win, RIM!") and http://news.ycombinator.com/item?id=2714270 ("Open letter to BlackBerry bosses")