That's a brand new excuse, Apple refused to distribute GPLv3 when GPLv3 was first published, 20ish years ago. How is GPLv3 incompatible with their system volume, yet GPLv2 is still fine?
replyGPLv3 added language which specifically requires that GPLv3 software embedded in products be distributed with "Installation Information" explaining how modified versions of that software can be installed. It is not at all clear how this would apply to software in an immutable, signed system volume. This language was not present in GPLv2.
replyhttps://www.gnu.org/licenses/gpl-3.0.en.html#section6
(There are other issues with GPLv3 which make it a dubious choice for companies like Apple, but this one is particularly problematic.)
This isn't new, GPLv2 is somehow compatible. This is the entire reason Mac OS ships an old version of bash but recent git.
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