You don't own any of those games. Valve's PC gaming digital marketplace has started including a notice on the shopping cart screen letting users know that purchasing a game on Steam grants them a license for it,

You don't own the games in your Steam library. Going forward, you'll be reminded of this fact every time you buy a game from the Steam digital storefront. The Steam checkout page now features the following notice: "a purchase of a digital product grants a license for the product on Steam.

Steam is now showing a new disclosure on its store checkout screen that clarifies you don’t actually own a game.

Ahead of new California legislation requiring storefronts to make it clear customers are only buying a license for digital content rather than outright owning it, Steam has implemented a message at the point of purchase doing just that.