Activated on Steam. Is this agreement thing a mistake?

[NeatNit]

I've been using Steam for years and am well aware what its limitations are. I don't really consider it as DRM.

But when launching Amnesia for the first time, it shows a SEPERATE agreement, between Frictional Games and the user. Most games don't show such contracts.
The quote is from there. By "loaded" I understand "installed", therefore "The Software may be installed onto no more than one computer at a time."

To which I have to say, what.