[CentOS-devel] koji / devel / packages

Just wondering; are the output files of the koji system no more 
accessible? I remember asking for some devel packages

https://lists.centos.org/pipermail/centos-devel/2019-May/017417.html

and at that time I could download the rpm files. Why this 
"administrative rules" now? Any reasons for that?

And in general; a lot of devel packages are missing. Whats the policy 
for that? Can we see these rpms in the PowerTools or Extras repos?

Thanks,
Leon