I'm not suggesting it's a way to go but there might have been some reasons companies hosted their own infrastructure (even at the cost). They controlled the up

I'm not suggesting it's a way to go but there might have been some reasons companies hosted their own infrastructure (even at the cost). They controlled the upgrades, and Microsoft for a long time couldn't even count how many copies of office, etc were being used because the software didn't phone home. That software is probably still running until it's updated to have telemetry added.