The thing about "moderator actions being exempt from API changes" is just plain silly. If you're going to put time into making a third party app, you still have to shut down even if the mod parts of your app are free if the cost of other users is untenable.
Every single 3rd party app that I've even heard of is also shutting down, so how people can try to spin this as something specific that Apollo did is baffling to me.