"Google's reaction is over the top, unfair and harsh"
I agree. Nothing I said implied otherwise.
However, developers that use the app store know (or should know) by now that doing so is risky and the rug can be pulled out from under them at any time. While I'm sympathetic to these developers, and I think that Google isn't doing right by them, I also think that there's a certain measure of "they should have seen that this was a possibility and planned for it".