Necrodamus: This always strikes me as such a strange and biased perspective. What has Valve and Steam done that's just so evil that you would label them as bullies?
LeonardoCornejo: Read their terms and conditions, you don't buy the gmes, you buy the permission to play them.
I realize I'm playing with black magic and necro'ing this thread but wanted to make this comment in case anyone else reads this...that's how it's been for many, many years and not just with Steam but also box versions. You own the LICENSE to play the game via the media that you purchased it on.
One article...and it applies to every game I can remember purchasing since at least 2000. I suppose I could dig out my mid-90's copy of Wolfenstein 3D but I'm pretty sure it was the same deal. Same with any software that I can recall like AutoCAD, Acid, Lightroom, Photoshop, MS Office, ICQ (edit: ok, maybe a bad example there), Quicken, etc. You never owned them, you probably never will.
http://venturebeat.com/community/2013/06/23/you-dont-own-your-games/
Edit: And for the record I'd love to see part 2 on GOG as well :)