It seems like Rebble (the board)
really overplayed their hand.
From what they posted, it seems like they wanted more control over what Core was doing, deciding that the best way to do that was to try and hold the app store data hostage.
Now, with the Core app open sourced and multiple app store repos supported, Rebble's position will likely be greatly diminished from what it could have been if they had been satisfied with what they had. I guess in the end though, the outcome was a net win for everyone (fully open source apps), so it works out.