From what I can tell a PKGBUILD is just instructions on how to download source and build it. I don't see how the Duckstation guy can complain about that, other than retards asking him questions. The license says you can modify the code, you just can't share your modifications. If I pull it from github and build it, if by hand or PKGBUILD then it's not sharing a modified version of the code. I know there used to be some Debian/Ubuntu 'binary' packages which did the same, pull down code and compile it locally due to license restrictions.