That work was all done around 2015 or so. MacOS has had the concept of a Metered Connection for many years now. The first party software all behaves as you would expect, and there are APIs that expose the information to third party software as well.

Can you elaborate? Never heard of such a thing. If anything, macOS seems to be loosing network features, such as the network location casualty in the recent System Preferences -> Settings reboot.

If you hit "Network Settings" on a Wi-Fi network in Settings, there's an option called "Low data mode"

> macOS seems to be loosing network features, such as the network location casualty

That was an oversight (as it remained in other parts of the OS...) and came back on the next point release of the OS.

Indeed, thanks.

I don't know if that will be enough, though. iOS has more granular settings for cellular data than a simple toggle. How will it reduce data usage? What services are allowed?