I only use them to dry my shoes and to wrap bio waste, but there's still about 3 (bi-weekly) newspapers getting delivered to my door. They are ad supported and I don't know anyone reading them, except for a few people over the years which complained about not receiving theirs.
I almost forgot there's also the community sheet ("Gemeindeblatt"), which includes local events, trash collection dates, job postings: coincidentally they are currently in need of someone delivering this local paper for the next few weeks.
Imo open sourcing is not necessary, as that is unrealistic depending on the licensing of libraries etc. Just distributing the server and making it possible to selfhost would be enough.
Or, built local network play in to the game itself (although this requires most of the work necessary for creating a selfhostable server anyway).