[no_way]

Chat apps are mostly one on one interaction, it is much harder run an open platform where every user can potentially interact with every other user, not even talking about search and how complex it gets. If Twitter is bloated or not is a valid discussion, but comparison it to WhatsApp is not.

[jiggawatts]

Ironically the one-to-many broadcasts are much easier to implement on a single box than as a scalable service spread across thousands of small container instances.