Hello! We are excited to announce Steam Families is now available for all users. Steam Families is a collection of new and existing family-related features. It replaces both Steam Family Sharing and Steam Family View, giving you a single location to manage which games your family can access and when...
This was previously available as a opt in beta, but is now available for everyone.
The catch is that many game publishers won't release their games on GOG, or wait for several years after release before they start to sell it there.
Technically, Steam DRM is optional and any publishers who want to can sell their games through steam without any form of DRM. The game files are transferable, and you don't need steam running or logged in to run the game. But most publishers don't want DRM removed, and so it's pretty rare.
No, many steam games use steam to verify if you own the game. It's up to developers if they require their game to have steam drm or not.
If the game doesn't have Steam DRM, you can just copy the game folder and run it anywhere. But many games will require steam (with an account that owns the game) to be running before they'll open.
See, that's what I thought, because I have tried to put a game once on another PC and it didn't work. So, it makes sense now, it depends on the devs. This is why I like gog. You just have the .exe and you can install it anywhere you want