Any game using Steamworks behaves this way, which is a pretty massive chunk of them. Ubisoft uses their own DRM which is an entirely different system. I think

Any game using Steamworks behaves this way, which is a pretty massive chunk of them. Ubisoft uses their own DRM which is an entirely different system. I think what you may be saying is the behavior if you open a Steamworks game while Steam is opened, it just executes as normal. Any authentication or nonsense happens in the background. Try opening a Steamworks game with steam closed, it will force steam to open and login before the game can be played.