Thanks for the suggestions. I've tried minetest, but I'll have to take a crack at she others. If it was just a game I played by myself, I would absolutely use those alternatives. I've played on a string of "civilization" servers for a decade or two now. Hundreds of people forming nations and interacting with real economies, diplomacy, and wars. A few key mods create the conditions of scarcity and balance destroyability/defensibility of the buildings. All of it is perched on a stack of custom mods. I'm not sure how hard porting them to Minetest would be. Some of these relationships are longer than my IRL friendships at this point.

When I started, we were using FOSS tools like Mumble to communicate, then they used Reddit and Team Speak, then eventually most nations moved to Discord for voice and text. I HATE discord. Maybe it's because I'm too old, but I can't follow a conversation for shit on there. At least everything is Linux compatible.

If I could find some interested devs to make the mods compatible, I'd gladly pitch in to help run a fully FOSS mineman civ server.

While the players can span all ages (a few grandparents on there), most are Gen Z and for some reason, Gen Z seems to care less about FOSS and open software. They've been propagandized fully by the proprietary web 2/3.0.