Yeah, if Youtube was "finished" we wouldn't have had Youtube Red, Youtube shorts, Youtube music, etc.

And yes, I am making a good case for mature software with those lovely examples. But clearly they wanted more widgets and they kept engineers who can deliver those widgets. This wasn't some unsustainable thing for Youtube as the top comment argues. And that's how most software businesses work as of now. If you remain complacent, you're slowly dying to competition. Because the demand for more still exists.