Sorra, Atlas, buying Sky.
There have been signs that Apple is going with Anthropic instead of OpenAI for integrating AI features.
This may partially be an aggressive strategic push to take the wind of out such a potential partnership.
even on web apps that are exactly the same across platforms my experience is you might more signups from windows users because somebody told them "hey, you should check this out", but the metrics on actual usuage usually favor the mac users.
I think it might be more the opposite!
They could be staying away to not intrude into Microsoft's "turf". MS is also pushing lots of AI integrations.
I suppose it's more likely that the main chat interface and other highly custom views have separate implementations on macOS and iOS, while the Settings view is shared SwiftUI code (since it's just a lot of buttons and toggles).