An example being cable companies. They should have no capability to own TV stations, media creators, news companies, the list goes on. Backbone is backbone, be it an internet connection, or a TV/video feed.
Back to Microsoft you can make an OS, or you can make apps, but not both. An OS being a 'backbone'.
Applies to Google. "Search" vs "Ads". Backbone versus 'stuff on top'.
Really, sadly, there are cases where co-mingled stuff makes perfect sense. But bad actors are why we can't have nice things.
I wonder, there have always been jokes about how the world would be a paradise without lawyers, but would that be more MBAs in the 21st? Whether cars, or computers, or even the ladder I recently bought that is junk, it really all comes down to MBAs.
Engineers input "that's not acceptable quality", and MBAs just tromp all over that.
MBAs, the "we can't have nice things" people.