What do you mean? As far as I know, it is perfectly fine to submit PKGBUILDs for non-free software (for both meanings of “free”) on the AUR. There are numerous examples of this, for example mathematica or renoise. This PKGBUILD does not make the new UI publicly available: it relies on the file being locally available, i.e., having been already purchased.

De: notify@aur.archlinux.org
À: aur-requests@archlinux.org
Cc: spidermario@free.fr, qoev@protonmail.com
Envoyé: Mardi 31 Janvier 2017 22:48:15
Objet: [PRQ#7398] Deletion Request for zyn-fusion

LionKingDabs [1] filed a deletion request for zyn-fusion [2]:

Umm they didn't release the source code of the new UI yet. I don't
think it's fair

[1] https://aur.archlinux.org/account/LionKingDabs/
[2] https://aur.archlinux.org/pkgbase/zyn-fusion/