What networking architecture Fortnite will use?

Are epic games using engine’s built-in dedicated server with hosted instances or buidling custom server software? I’m working on game(meant to be played online) and hope to use built-in server(multiple instances per VPS) and just care if all possible game revenue won’t flow into cloud provider’s wallet.

I guess I have relatively the same question. Is it going to be possible to run seerver instances on demand?

I too would like to know the answer to this !