Exactly my point. If MS were to provide the level of support to which we are accustomed for Windows or Office or the like, it would cost a fortune.
What one company can do, another can do too. The fact that an apparently highly profitable product has no competition is an anomoly. Manufacturing and supporting airliners, automobiles, microprocessors, and gaming consoles isn't exactly easy either, yet each of these industries has multiple players.
Do Microsoft and Adobe offer free tech support with their software these days? I honestly don't know, because the idea of calling Adobe's support hasn't even crossed my mind. These days most questions about how to do something can be answered by a quick Google search. If that fails you can always try a user forum, or even a good old-fashioned book.
The only times I've had to call Microsoft's support were to fix problems with their troublesome activation process. The support staff were polite and efficient, but I wouldn't have needed to bother them if the software had been better designed.
I realize that "support" also means things like adding support for new cameras and lenses. This is a major task, but hardly insurmountable. DxO Labs have apparently been doing OK, and they're a minnow compared to Microsoft.