Besides the Vapour platform, the leaked source files also reveal something called VapeWorld that is built on the Unity engine and looks like a VR chat game with 3D Twitch chat emotes. Additionally, the existence of a "metaverse" folder could suggest Amazon's plans to integrate NFT and other crypto tokens with Vapour.
https://www.notebookcheck.net/Twitch-hack-spills-the-beans-on-Amazon-s-Steam-like-game-store-codenamed-Vapour.569796.0.html