There's been a bit of a furore in the emulation community lately centred around the PlayStation 1 emulator DuckStation, which has now seen two license changes recently.
The problem from the article is that the GPL was violated and somewhere downstream the user demanded they fix something to upstream. Being that downstream has modification without being published (my assumption on the GPL violation, either found due to inconsistent bug reproduction or other), the author is understandably upset.
I’m fine with the former, the latter should be “no derivatives that attempt to relicense for commercial use”.
Saying “no forks” is as anti-OSS as you get really, short of hiding all the code under your mattress ala MSFT.
The problem from the article is that the GPL was violated and somewhere downstream the user demanded they fix something to upstream. Being that downstream has modification without being published (my assumption on the GPL violation, either found due to inconsistent bug reproduction or other), the author is understandably upset.