Is it expected Copr services could (backend/frontend, I am aware dist-git machine already does) be run on CentOS 7? I was seriously thinking about it some time ago, I've done some downstream changes, but after some time those are not useful .. the code is not ready .. and it is getting worse (hard dependencies on dnf, etc.).
The benefits would be that we wouldn't have to do the updates (and thus downtimes) so often due to fedora upgrades N -> N+1. I would be ready to help, but there would have to be consensus that we are not against it.
Pavel