I think you mean stole, past tense. If you read much about the rationale of Arch, it was meant to imitate FreeBSD quite closely. This was especially true before the systemd migration, when there were only 1 or a few files in /etc you had to touch to configure almost everything in the system. It is clear they dervied the AUR concept from the ports system of FreeBSD fame.
https://wiki.archlinux.org/index.php/arch_compared_to_other_...