My 2cents. Messaging is a weird app to focus on mau/dau. There have been many messaging protocols which scale to hundreds of millions of users, and there is p

My 2cents. Messaging is a weird app to focus on mau/dau. There have been many messaging protocols which scale to hundreds of millions of users, and there is prior art of large not particularly valuable chat systems like aim, gchat etc. No one is going to use a consumer messaging system which charges money or shows ads. Which brings to mind substantial questions on the business model others are using the messaging platform for e.g. data collection.