We already have !opensource@lemmy.ml, which Libre culture is a sister ideology to, but it’s a little ambiguous whether Libre culture includes all open source or just the copyleft parts. I’m going to assume everyone here knows the difference between open source and copyleft and the problems with permissive open source, so I won’t get into it now. I’m holding a community discussion on whether this community should allow sharing of non-copyleft projects, or if that should go in !opensource@lemmy.ml while !libre_culture@lemmy.ml focuses on Libre philosophy and sharing of copyleft projects.
I should note that disallowing non-copyleft projects would not disallow discussions of open source regardless of whether it mentions copyleft, just the promotion of non-copyleft projects and non-copyleft licenses.
In my opinion, the differences between “copyleft” (by which I think you mean free, as in the FSF standard) and “open source” is not so cut-and-dry good vs bad. For instance, many libre culture enthusiasts have their reasons for using more permissive licenses (MIT, Public Domain, etc) or more restrictive ones (like the Peer Production License), neither of which meet the FSF standard.