Hi, there was an idea to turn on the "Follow Fedora branching" feature in Copr by default (for newly created copr projects). That feature automatically creates new fedora-NN-* chroots from fedora-rawhide-* chroots (at Fedora branching time), and "forks" the related builds (so the packages don't have to be re-built manually).
If you are concerned about this topic, consider looking at/voting in https://pagure.io/copr/copr/issue/332 .
Pavel
copr-devel@lists.fedorahosted.org