Ruby should go back to oldschool, before things such as splitting the community, adding arbitrary 100.000 download limits (past that point you can no longer remove your project from rubygems.org; on github.org there is no such restriction. This madness comes from top-down people thinking they control the ecosystem).

As for the idea itself: it is not a bad idea but sounds way too bureaucratic. It should be automated or automatable, no matter where, be it hosted on codeberg or github. Say I have a project on codeberg; I would like a subforum or something like that, so I'd register this via some commandline gem or so that does that. (Also, https://www.rubyforum.org/ is looking strange to me ... github issue trackers or discussion seem more logical to me). Can that be styled or themed? I mean, having alternatives to github is a nice thing but I can't quite imagine how it looks. They should do some screenshots, overview, demo or something like that.