> I could imagine accessory and case manufacturers would be keen to know [...] There's also a large ecosystem of Apple news sites that would probably pay [...]

The article says, "the group is demanding that Apple pay an undisclosed ransom for the images/schematics they obtained via the supplier by May 1 [...] Until then, the hackers will continue to post new files every day, REvil said on its blog."

The target is only Apple itself, the random group does not accept third-party payment and will make all information public if it's not payed. So I don't think the group wants to sell the information to accessory manufacturers or Apple news sites.