Arvind's making the case that the algorithm isn't particularly special and it's all about the system design which hooks users. It's definitely true that a huge

Arvind's making the case that the algorithm isn't particularly special and it's all about the system design which hooks users. It's definitely true that a huge part of their user retention isn't some magical algorithm, but they have made some genuine algorithmic/training improvements which are interesting. They published their methodology a few months ago (https://arxiv.org/abs/2209.07663 https://arxiv.org/abs/2209.07663), which wasn't referenced in the article (only an official blog post and a few reverse engineering attempts that I don't think are enough to conclude that their recommender is just run of the mill).