I'd bet on UI and marketing. The player is very unobtrusive and minimalist, and simple things like pronounceable random names probably appeal to the user. Als

I'd bet on UI and marketing. The player is very unobtrusive and minimalist, and simple things like pronounceable random names probably appeal to the user. Also, features that are well-known to heavy reddit users (such as easily resizeable videos) only helped with the word-of-mouth.