@Suiseiseki I'm not talking about custom software built for a business, I'm talking about the software that exists for a given industry which, taken as a whole, is rather niche but is very common in the industry it was developed for. Ansys or Flow3D for computational fluid dynamics, Leapfrog for geoscience, ArcGIS for mapping, Bloomberg for finance, Adobe Premiere or After Effects for video. A lot of businesses don't contract custom software when industry standards are already available and expected and replacing those applications would take a long time.

And when I talk about support, I mean that companies like Esri who at least offer a Linux based install of ArcGIS Enterprise, have no support staff for Linux installs, but only for Windows Server.

Also Octave is pretty useless without Matlab's toolboxes & Simulink. Just because software is libre don't magically give it more features or a better user experience, especially when there are plenty of paid employees working on the proprietary software. It's gonna take a long time to reach parity in a lot of industries. Is it possible to easily draw a circle in GIMP without plugins yet?