used. Apple used. It's legally a dead trademark, so Apple is claiming ownership of something they've already abandoned, but enforcing that nobody else can reclaim it, despite being a good name. That's not right, they don't just get to name squat.

Perhaps you’re right. Apple's App Store review can be a rough process. Then again, a search of “Inkwell” in the App Store shows plenty of apps that are named “Inkwell”, many of then writing-related.