And proof for your claim is...where?
Without Game Pass, The Coalition probably would not have started to develop small projects, because Microsoft would want them to churn Gears games like they used to. Obsidian is currently making it's biggest game with Avowed. Ninja Theory have 3x more devs on Hellblade 2, than on first game. State of Decay is supposed to have way higher budget then SoD 2. And higher budget will allow inXile to go first-person and not having to develop inexpensive top-down RPG games.
It's funny how every "Game Pass hater" is using same arguments how it will make games worse without single proof. Quite the opposite. Microsoft have 23 first-party studios and without Game Pass they would be stucked with 5. Devs have more freedom (for example The Coalition), more time (Without GP, Microsoft would force Halo Infinite to release alongside Series X/S), and more money (Obsidian an inXile). If they want to create small game because they want to, they can (Obsidian with Grounded). But nothing is forced upon them which is best case scenario. And they can experiment without the fear of going under like Japan Studio.
So again. Where is proof that GP will make games worse?
That's horse shit. The Coalition are currently the most valued next to playground games.
So much they are helping out on Halo infinite.
They actually make games in a effecient maner.
So Microsoft gives them freedom to do what they want because they have proven to be able to work on multiple projects. And help out other studios.