What are you talking about? How is it ‘walled’?
There are freely available and free of charge Gemini and Gopher clients for every platform, almost all of which are open source. No signups to any service are required. For that matter, there are Gemini gateways on the web, so you don’t even need to install anything.
If your definition of a ‘walled garden’ is anything that can’t be accessed directly by the web browser Google or Apple pre-installed on your device, I think you might want to reconsider.
No that's not my definition but also, why would I reconsider? Are you angry at Google or Apple and trying to defend the Tildes or something?
I'm using "walled" in the sense that there's a level of gatekeeping the community does, so builds up walls, to attract a certain kind of person. This kind of person _wants_ to hang out on a shared TUI-based *nix system. That's the wall. Much like a signup wall requires people have logins. That's all.
Regardless of your definition of “walled”, you seem to simply not know about tildes. There is no need to use a TUI or hang out on a Unix system to view the content.