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Re:macOS 10.15 Vista by pjmlp on Wednesday October 09, 2019 @03:03AM (#21200774)
They are allowed, it is just like everyone else on comercial world, they rather not deal with copyleft software licenses.

Which is a quite different issue.

Re:macOS 10.15 Vista by dwaite on Wednesday October 09, 2019 @03:22AM (#21200863)
AFAIK GPLv3 means (among other things) that if a company is slapped with an injunction due to a patent suit, you can't just license the patent for yourself - a patent license has to cover all GPLv3 usage.

They are allowed, but some of the legal consequences to the new terms in GPLv3 are worth stalling updates, choosing alternative system components and even rewriting components to avoid.