Being Electron doesn't mean that the developer will release builds for all platforms that Electron supports. Discord took 3 years, for example.

> What is Windows's moat among the business crowd?

The moat is that it just works[1] will all of their software developed over the past 30 years, and support contracts/staff[2] is incredibly easy to obtain.

1. Contrarians will say that wine has better backwards compatibility than windows, but that's just cope and limited to a handful of games (and even then it's only because people made elaborate compatibility profiles for those specific games, those won't exist for internal apps).

2. Linux sysadmins are easy to obtain, but dedicated staff to support a desktop linux fleet is still fairly niche. There is some overlap in skillset and sysadmins can learn, of course.