It is important to node here that by "Server" they mean the Discord logical server concept which may more generically be called a "community", "group" or "works

It is important to node here that by "Server" they mean the Discord logical server concept which may more generically be called a "community", "group" or "workspace". It has nothing to do with the physical compute architecture. So a title that would make sense to people not familiar with Discord terminology could be: > How Discord Serves 15M Members of a Single Workspace