luceos it's not done automatically. TBH I didn't actually though about the in-built server. But I can see that it has also a support for Pusher, which should work?
I could technically let people start the server from the FreeFlarum page, but that would probably make our CPU usage go high. I'd like to let people use it with Pusher only. The main reason why it was included is to provide support for realtime messages & replace Pusher anyways. If it already works with Pusher, then I can see that including it is useless
