Iirc, the creator of Duckstation has been salty about repackaging his stuff for a good while. He had disagreements with how RetroArch made a core from his emulator, citing some sort of licensing violation (not asure the validity). So someone forked his codebase and made the Swanstation core, and he publicly exploded and ceased development of Duckstation.

He must have come back at some point for his opinions to be relevant again I guess.

As far as I understood things, he’s always been touchy about what others chooss to do with his code, even having negative reactions to basic bug fix pull requests.