My call on the reason why Apple has not let any IM app push ready out?: ATT...
Think about it... If they enable push for all IM's apps, ATT KNOWS people will stop or lower their SMS plans (on which they make easy money out of). TextFree unlimited has been out, but still hasnt reached the acceptance level that Yahoo! Messenger or Beejive has. I know that there's people that own an app but never submit a review, but lets take that into consideration:
Textfree unlimited: 1369 ratings
Beejive: 3134
IM+ Lite: 2377
Yahoo! Messenger: 17396
If we add all of the big IM's (yahoo, IM+ & beejive), it equals to 22907. That is 22907 "possible" people that use the SMS plan that ATT charges. That same amount of people might lower or remove their SMS plan. in the end, it affects ATT. Im not saying it is THE reason why they havent released push on those specific apps, but it could be.
Think about it... If they enable push for all IM's apps, ATT KNOWS people will stop or lower their SMS plans (on which they make easy money out of). TextFree unlimited has been out, but still hasnt reached the acceptance level that Yahoo! Messenger or Beejive has. I know that there's people that own an app but never submit a review, but lets take that into consideration:
Textfree unlimited: 1369 ratings
Beejive: 3134
IM+ Lite: 2377
Yahoo! Messenger: 17396
If we add all of the big IM's (yahoo, IM+ & beejive), it equals to 22907. That is 22907 "possible" people that use the SMS plan that ATT charges. That same amount of people might lower or remove their SMS plan. in the end, it affects ATT. Im not saying it is THE reason why they havent released push on those specific apps, but it could be.