You probably haven't heard of klarna, or discord, either.

About Discord see my other comment - I don't think Elixir is their main language.

> From day one, Discord has used Elixir as the backbone of its chat infrastructure.

https://builtin.com/software-engineering-perspectives/what-i...

> Another is a re-architecture of our guilds service, which as our biggest communities have grown, started struggling to handle 100,000 connected sessions per Elixir process. We horizontally scaled the Elixir processes so that we can scale as the number of connected sessions increases... Many of our stateful services that maintain connections to clients, and process and distribute messages in real-time, are written in Elixir, which is well suited to the real-time message passing workload. But in recent years we have run up against some scaling limitations. Discord has written and open-sourced several libraries that ease some pains we’ve encountered with managing a large, distributed Elixir system with hundreds of servers