Understandable. Xbox pays developers to have their games on GP and most games are on a timed contract. Xbox owned games are the exception. There are also a few games on gamepass that have been there for what feels like always, Slay the Spire, Monster Train, Monster Sanctuary, and many of the RyuGaGotoku games were on there, had the contract time out, then MSoft and RGG brought them back to Gamepass