I reckon they might be using a lot of Windows specific libraries, making any porting a real pain in the ass. And when you’re in that space, unfortunately people just have to choose the OS that goes with their applications, not the other way around.
It’s literally easier to start an entirely new CAD/CAM project and make that cross-platform. Unfortunately, that’s a 7 or 8 figure proposition to get started as well (probably 8 for a polished product that can pull proper market share).
That’s fair. This being the Fediverse, private messages aren’t private either, so protect yourself!