Here's the VP of Reddit's community cited in the article, Laura Nestler, preaching super engagement from a platforms most fanatical users to power content for the 90%.
She suggests, intrinsic motivators such as "autonomy".
https://m.youtube.com/watch?v=vWUMW6Ovf6o
She was at Yelp prior, which if you want to look at a steaming pile of a wasted company, man give reddit 5-10 years.