alt Hacker NewsI thought the whole concept of a viral license was legally questionable to begin with. There haven't been cases about this, as far as I know, and GPL virality enforcement has just been done by the community.
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There have been a number of of cases, which are linked from Wikipedia (https://en.wikipedia.org/wiki/GNU_General_Public_License#Leg...) - most recently Entr’Ouvert v. Orange had a strong judgement (under French law) in favour of the GPL.
Conversely, to my knowledge there has been no court decision that indicates that the GPL is _not_ enforceable. I think you might want to be more familiar with the area before you decide if it's legally questionable or not.
If you don't like the license, then don't accept it.
You are then restricted by copyright just like with any other creation.
If I include the source code of Windows into my product, I can't simply choose to re-license it to say public domain and give it to someone else, the license that I have from Microsoft to allow me to use their code won't let me - it provides restrictions. It's just as "viral" as the GPL.
The GPL was tested in court as early as 2006 [1] and plenty of times since. There are no serious doubts about its enforceability.
[1] https://www.fsf.org/news/wallace-vs-fsf