Uhhh yeah... Not so sure I would be sharing this publically. I know an NDA doesn't have to be signed with them but I'm sure they wouldn't want EVERYONE in the world to see the test.
Its a waste of their time to explain to dozens of people why their work wasn't good enough, or to tell them a better applicant was found. They don't have to give you any feedback or reasons for hiring someone else, just like any other business.
Giving constructive concise feedback takes time and effort, if the art lead & HR team wrote a personalised reply to each candidate they would have time for nothing else. To send you back a pre-written response would be more damaging in the long run. Its a case of better to say nothing at all.
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They told me that when they gave me the modeling test earlier in the year.