Debian, openSUSE and Fedora have founded together the Linux Distributions Working Group at the Open Mainframe Project for achieving better support for the mainframe architecture s390x and collaboration for providing solutions. That has been such success, that SUSE, Red Hat, Canonical (Ubuntu), AlmaLinux and Rocky Linux have joint also. The question has poppeed up, whether we should be restrictly open only for all Linux Distributions or should we include also important upstream projects in our Linux Distributions Working Group. In this presentation we will represent the existing benetif for all Linux distributions and go into detail, which (base) upstream projects should be included/invited and why. Finally, we want to receive feedback during the Q&A session with a discussion, how we should proceed with this idea.