Mawthra: And the interesting thing is... since day 1 on the EGS, the game has never had any DRM whatsoever
Mandatory store client
is DRM by itself, because
Digital rights management (DRM) tools or technological protection measures (TPM) are a set of access control technologies for restricting the use of proprietary hardware and copyrighted works. DRM technologies try to control the use, modification, and distribution of copyrighted works (such as software and multimedia content), as well as systems within devices that enforce these policies.
The store’s client does just exactly that.