It's unfortunate that Microsoft didn't work toward making it an open source standard for documentation. We'd have avoided every other documentation having it's own format, style, etc... Plus you get the whole documentation in a single file, not worrying about broken stuff, missing images, broken links, etc...
MS tried completely shut down and end open internet based on open standards. Their Blackbird project attempted to make create completely closed alternative MSN (The Microsoft Network) with closed publishing, search and software. Instead of Wikipedia, we would check out things from Microsoft Encarta.
It's funny you bring that up. I just noticed yesterday that MS Word now has a Wikipedia button: https://imgur.com/a/zbcLZGj Things change!
I'm a huge chm fan but I for one don't want out of update electron apps to open everytime I look up something. And then they would still go online to find up to date stuff anyway.