This whole subthread is based on you misreading the original assertion (from someone else) and being off by a couple of orders of magnitude-- then pretty badly misreading me.

There's plenty of reasons why firms will want to run this stuff on-prem, both for their own usage and as a service. It probably will not be the majority of usage or zero, but instead a noticeable small chunk.

Yes, it's more expensive than many things, but not anywhere close to the most expensive service that people choose to run on-prem. And you can still support a decent userbase from a few computers, depending upon what you're doing.