Source please. Otherwise it sounds like you’re just talking out of your ass
Well first, I have faith that you read my comment properly and understand that I'm talking about peer to peer online, so with that said here is wikipedia:
Game server - Wikipedia
------
Peer-to-Peer
In the client/server model outlined elsewhere in this article, clients receive processed data from the server and display it without much thought. In the alternative "peer-to-peer" model there is no server: each "peer" instead receives the raw input streams of each other player and determines the results itself.
[4]
The only thing that xbox (and its not even xbox its almost always the publisher like EA or Ubisoft) does is provide lobbys and matchmaking. Does Xbox have servers they provide (edit: I looked it up they do), probably, but thats not really that clear so I dont know, I just know there was a big stink when For Honor was going peer-2-peer, and if xbox servers were there to be used i dont know why they wouldnt.
Now for non-peer to peer games, thats another subject. But a huge amount of games are peer to peer. Fighting, sports, and racing games are often peer to peer.