The only "downside" to the CI pipeline for generating Win32 EXEs is you can already do this from Linux, I don't recall if C does, but I almost want to say gcc will do it from Linux, I definitely know on Linux with FreePascal/Lazarus I've generated an EXE file. So you don't truly need ReactOS in this regard, but maybe the CI pipeline for testing and confirming that it works might be worthwhile to ReactOS to create some sort of profitable project. I'm thinking of things like Puppet or other web automation testing tools, but for GUIs on Windows using ReactOS as the host, with automated UI tests that output screenshots.
I would love to see ReactOS get more serious funding, and get farther ahead than where it is today.
Lazarus/FreePascal 32bit does work on ReactOS. Also some older versions of Tcl/Tk / Tclkit works. ReactOS has GUI package manager with some programming languages etc.
I didn't actually mean generating the EXE from ReactOS, that's easy in Linux. (I develop for Windows in Linux and MacOS.) But I meant regression testing on ReactOS.
You can use Conveyor to generate MSIX packages from Linux or macOS if you want to ship Windows apps from a Linux machine. (https://hydraulic.software/)
I would love to see ReactOS get more serious funding, and get farther ahead than where it is today.