[throwaway92394]

> CLI programs tend to be FOSS

I think this is more likely because they're often made (or at least started) by individuals as a hobby or side project, not as a commercial venture. CLI is generally easier to develop then GUIs especially cross-platform.

> GUI programs tend to be proprietary and non-gratis.

GUIs require so much more work, especially for cross platform. If engineers are paid for their time then this is worth it.

Granted electron has made it far easier - you still need to be essentially a full stack developer to make a GUI with it.