Mike McLean is lead developer for Koji.
Koji is an open source build system. While many are familiar with Koji because of the Fedora Project's use of it, Koji is a generic system that is used by different groups…
The point of those restrictions is to prevent derived works from being proprietary. In a world where copyright law applies, the GPL is the closest approximation to a world without copyright. I think the GPL preamble fairly well explains the reasons for the restrictions.