Duckstation license choice of CC BY-NC-ND is dumb for software for a number of reason—wouldn’t argue that. But there are software licenses in a similar vein, inspired by CC NC but actually for, ya know, software, that do what they want without being fundamentally problematic—and these were the “such licenses” I was talking about the whole time & should be tested/trialed. I think you misunderstood my phrasing.

No modification is a bummer, but I could argue for in either direction more strongly a) some source you can modify but you can’t contribute (like Microsoft’s closed-off Language Server Protocol) which is different level of restriction that flies in the spirit of having a open license making ‘modification’ not open enough since you can’t really get all downstream implementations to support your fork or b) I would be happier being able to see the code such as the encryption used that would be better than nothing (like whatever Discord is trying to tell users it’s definitely-not-back-doored E2EE setup is… trust us). “ND” is better than nothing & imperfect, but it can be seen as a spectrum.