> I'm certain you will never see ads in MacOS as part of the OS "features."
How certain?
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...
How certain?
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...
This MAY make sense in tvOS, to present ads during a "channel" app while "disabling certain operating system features", but I really hope Apple of all companies aren't that greedy for extra revenue to include ads in macOS/iOS..
The patent filing is also dated 2008, and nothing's happened so far.