chakkra said:

I'm surprised nobody has thought of the possibility that they might have been trying to convince Nintendo to bring some of their games to X1 and Nintendo refused. This one way street "partnership" didn't make sense to me since the very begining.

It's called money. No one is buying an Xbox One because of Cuphead or Ori. So if they're not selling hardware what's the point in keeping them exclusive when you can make money from them elsewhere?