Apparently some companies were modifying and packaging Duckstation in commercial products without contributing their changes back into the project which seems to be what ticked him off this time
That’s kinda the point of FOSS - that free to use means free to use.
That being said, the only times I see the downsides of this policy is when downstream messes with software on a permissive license, then doesn’t support users when the stuff they messed with fucks up - Usually Linux distros rebuilding software to use fucked up dependencies.
Duckstation was licensed under GPLv3, which requires that not only downstream changes are shared upon request, but everything used to build that source too.
Arcade1UP refused to share changes they made to support some Simpsons arcade cabinet they were selling. They eventually shared the changes after being pressured, but even then the sources they shared weren’t in any decent or buildable state. Some additional context: https://old.reddit.com/r/Arcade1Up/comments/10osxo0/john_d_states_arcade1up_is_not_in_violation_of/
If I was maintaining a project the size of Duckstation I’d consider this my last straw too. He’s cleared the license change with all contributors so it’s his call to make.
Ultimately if the license is a sticking point the community can fork from the last known GPLv3 commit and continue work from there. Using Swanstation is also an option as that was forked a while ago.
Emulators come and go all the time, this is no different.
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