Relevant part of YouTube TOS that'll come into effect on 2019-12-10:

YouTube may terminate your access, or your Google account’s access to all or part of the Service if YouTube believes, in its sole discretion, that provision of the Service to you is no longer commercially viable.

However, it's not clear whether "Service" is YouTube or whole Google account. As we've seen in Markiplier affair, violating YouTube TOS meant that people lost access to their whole Google account - including gmail and gdrive.

Here's the official blog post: https://www.blog.google/products/stadia/lineup-games-coming-to-stadia/

But since they decided to list the games in the incredibly convenient format of... three slideshows, I'll re-type the important info here and save you that trouble.

Launch titles:

• Assassin's Creed Odyssey
• Destiny 2: The Collection
• GYLT
• Just Dance 2020
• Kine
• Mortal Kombat 11
• Red Dead Redemption 2
• Rise of the Tomb Raider
• Samurai Shodown
• Shadow of the Tomb Raider: Definitive Edition
• Thumper
• Tomb Raider: Definitive Edition

Planned releases in the rest of 2019:

• Attack on Titan 2: Final Battle
• Borderlands 3
• Darksiders Genesis
• Dragon Ball Xenoverse 2
• Farming Simulator 19
• Final Fantasy XV
• Football Manager 2020
• Ghost Recon Breakpoint
• Grid
• Metro Exodus
• NBA 2K20
• Rage 2
• Trials Rising
• Wolfenstein: Youngblood