Fixing unwarranted bans or other lesser account actions? Reverting lost SR? Completely out of the question for them. They always stand pat against manipulating individual player SR or MMR for anything. It’s all “sorry for the inconvenience, but we made a change (hopefully for the better this time), so just keep playing and let the system sort itself out” sort of attitude.
If they do any sort of “compensation” at all, then knowing this new team, it will be advertised that way—blown way out of proportion for their generosity and apologies for letting such an amateurish game-breaking feature slip through—to embellish an otherwise ordinary planned and scheduled double XP weekend event.
I’m doubting they’ll throw up another keychain for free in the shop again. Too soon.