Servo as a fully-featured web browser does indeed not seem to exist anymore but some of its components such as Webrender still do and are actively maintained.
servo was never a fully featured web browser and was never proposed to be iirc. It was proposed as experimental from the start. The most we got at the time was browser.html
Back in... 2018? there was a Servo binary you could download that had an address bar and could be used to browse the web. That actually started to get stripped down over time, the later binaries had less and less functionality, until now I don't even think there are any. Servo spearheaded a lot of projects, like bindings to macOS frameworks from Rust, that would have been used to create a more comprehensive browser, but then got torn down once the larger thing was canceled in favor of certain components, like webrender.
I don't know when exactly it was canceled - maybe around the time Firefox Quantum shipped.
Note that I never said it was ever not experimental. Just that it would have been more until it was canceled.
