Not weird at all, makes perfect. The code/idea is so trivial that I would find it hard to believe any accusations on the author of the code...

One could probably modify a much more sophisticated/fast brute-force software to attack iCloud, like hydra[1].

Given the deep pockets Apple has, I don't understand how something like this was even possible.

[1] https://www.thc.org/thc-hydra/

Currently the rumour is that the photo leak is an underground celeb photo sharing ring, where you use photos you've hacked to get access to more photos, and isn't limited to iCloud / Apple, but who knows.

This attack was already described by JB'ers for a long time.