It is not open source, because it does not meet the definition of open source.

I’ve noticed that some “mobility” startups are using Linux. E.g. companies working on electric or automated vehicles.

Turn based, or at least have a pause button (in single player).

Yes, but does that still count as “modern”?

How exactly would it “get stomped”, and by whom?

I think you mean Tactics Ogre. Although it’s a spinoff of another game called Ogre Battle.

BTW, there is a miniflux package in Debian testing / unstable: https://tracker.debian.org/pkg/miniflux

Maybe each server is hosting a different area in the game, and they are connected by portals. Would need a way to transfer users and their inventory to another server.

I’ve been playing CrossCode on Steam Deck. It’s pretty great, I like they kind of simulate being an MMO, like other “players” running around in the areas.