We can attribute this success to the desire to do excellent work and tell important stories that matter. The stories are out there, they exist we're just telling them. Of course, there's a lot of rigour in ensuring that the stories come out right. Fortunately, there are systems in place to ensure that this happens.
For instance, I'm a fantastic writer but you should see some of my first drafts or see the comments on my article after the editor has worked on it.
One day a colleague in another department was casually showing me comments on her work and asking why they were so many. I was confused at what the issue was because there were like 5 comments. Later that day, I showed her one of my articles that had just been edited. It had 118 comments/suggestions! Granted that was a bit unusual and the draft I submitted wasn't the best, but the point is the system helps correct that.
Constant experimentation is also vital. We're always trying out new things. Having ideas is the easy part, executing is where the work is at. For the newsletter, for example, we've worked on things like monitoring the time it takes for the images to load, to how likely people are to click on the share button. There's a lot of intentionality that goes into ensuring that we keep delivering quality content.
Who: The team. When I say the team it's the editorial, growth team and anyone else who chips in a piece of advice. If I start to name names now I'd leave out someone important, so I'd leave it at that.