They did implement their game server in Elixir, and it performs great for them in reality. From what I understand, they are supporting 10 000 players with a low

They did implement their game server in Elixir, and it performs great for them in reality. From what I understand, they are supporting 10 000 players with a low CPU and memory usage, so if this scales linearly they should be able to support 100k players. You're also ignoring the reliability aspect, which is why they chose Elixir (and the BEAM) in the first place. Performance is also less of a problem since they're on the server, and thus can add more hardware as needed. Could you share a bit more about your experience in the industry? I think you and they have different use cases, which makes you reach different conclusions.