Here's what NVIDIA has to say about it:
We’re transitioning as many games to GeForce NOW as possible over this time. For those leaving, we’ll give gamers as much notice as possible. Games from Warner Bros. Interactive Entertainment, XBOX Game Studios, Codemasters and Klei Entertainment will be removed from the service on Friday, April 24. We hope they’ll return in the future.On the bright side, NVIDIA is still adding more supported games. The full Assassin’s Creed and Far Cry series are now supported, with more Ubisoft titles to follow in the coming weeks:
In the meantime, look for Game Ready on GeForce NOW releases every Thursday, including larger batches throughout April and May.
“Ubisoft fully supports NVIDIA’s GeForce NOW with complete access to our PC games from the Ubisoft Store or any supported game stores,” said Chris Early, senior vice president partnerships at Ubisoft. “We believe it’s a leading-edge service that gives current and new PC players a high-end experience with more choice in how and where they play their favorite games.”