Massive 12TB Steam Leak
 

The leak is apparently due to an unprotected API endpoint giving lots of internal game builds. News: https://www.tomshardware.com/video-games/pc-gaming/massive-12tb-steam-leak-reveals-decades-of-unreleased-games-archived-files-include-unseen-half-life-2-episode-3-builds-and-assets

Browse the leaked data: https://steam2-db.pages.dev/