Hear the phrase "public access unix system" and you might very likely automatically think of the Super Dimension Fortress. And rightly so; SDF has been the big name in the game for literally decades. But they're not the only pubnix out there, and these days (late 201xs) more and more are popping up (just check out the tildeverse!). That's only a good thing. Giant centralised systems with thousands and thousands of users aren't any better in the pubnix sphere than they are in the rest of the net.
For me, the most exciting new arrivals are the "micropubnixes": small, lightweight public access systems with no aspirations to be anything more. There's no strict definition of a micropubnix, but the quintessential example might be a Raspberry Pi or similar single board computer, connected to somebody's home router and providing just a few basic services (like gopher hosting!) to a dozen or so users. They're simple, spartan, unique and quirky. It's unixpunk, and I love it.