Yeah, needing a controller is the only limitation I don’t like. I understand that it’s going to a Xbox Series X server though, so the requirement makes sense. But it means I can’t play Quake at work this morning through xCloud, since I don’t have a controller. Once I could get into the game, it does have keyboard and mouse support even on Series X, so I could get it work that way if I had a controller.
(And yes, the need to be an insider is old news, it’s open to all Ultimate members now).