You don't always need to download pre-compressed files. You can compress your existing library:
The GameHub Emulator allows you to import PC games. You can further optimize these by using the GameHub Lite version, which is a privacy-focused, stripped-down alternative that removes tracking and unnecessary permissions. Safety and Risks compressed game hub
Tools like CompactGUI can shrink games like Ark from 169 GB to just 91 GB without modifying the game files. You don't always need to download pre-compressed files