Dunno, I think I prefer patents. Unlike copyright, patents usually last a flat twenty years. Copyright expires either after 95 years or 70 years after the death of the author, which is ludicrous. Both are constantly abused, but at least patents expire in a reasonable amount of time.
Kinda insane how many people in a nominally open source community are defending this guy for switching to a proprietary license. If DuckStation gets shut down then I say good riddance. It is not the only PS1 emulator in town and I will not miss the endless flow of Stenzek-related drama.