It does seem like they have...
The app in the BB App World is horribly broken on my Torch. There are plenty of reviews in App World that indicate that its broken, and that should also indicate that there are plenty of people *trying* to use it.
There are tons of apps for BlackBerry, it isn't that hard to develop for it (I'm a developer, trust me). Its pretty obvious that whoever is responsible for these mobile apps is simply ignoring the BB platform for whatever reason. They even wrote an app for Palm WebOS... a platform with like 1% marketshare. Really?
Has Chess.com completely abondonded the BlackBerry app? This is unfortunate as I and many others I know use this for the majority of moves. The iphone app is excellent, why all the problems with BB? (aside from the obvious fact that Apple is a better product - some of us have no choice)
~ frustrated