I’d probably bet that the majority of games on steam have less than 1000 sales, so being a popular game on Steam probably doesn’t mean much compared to being a popular game by daily active users viewing unity ads.
The methodology on the site only includes games with a minimum popularity, so the long tail of tiny indie games isn't included. By the way, since steam has a fee to be included, aren't most of those tiny indie games over at itch.io anyway?
> Unless stated otherwise, we filtered out unreleased games, free games, those that launched with less than a $4.99 price point, and those that have fewer than 50 reviews.