Those of us who use it. Tangled is a neat project and architecturally it makes a lot of interesting choices but code-wise it's relatively simple and from my personal forays in it I'd say pretty easy to maintain.
The majority of the codebase is loosely related go modules. Then some static HTML+CSS. And finally a small sprinkle of typescript to tie things together. And of course a bit of Nix for orchestration.
IIRC it all runs on a pretty trivial amount of hardware that a single person could currently host by themself.
Users' knots, spindles, and PDS (plus atproto at large) do the real heavy lifting infra-wise.