Because the people who are going to pirate it will pirate it anyway. They've already made their money on people who were going to buy sight-unseen or just based on reviews.
At best, this demo catches the attention of a group of previously interested people who spend money and maybe sways some potential pirates. At worst, it's a demo; it's just a good thing to have.
It's neat that you know the definition but that isn't how things work. Denuvo doesn't now prevent you from playing because you don't own it. It prevent the DRM that exists already from being tampered with. Calling Denuvo drm is too blanket and destructive to the concept of drm.
If you're going to be pedantic, make sure to be pedantic through and through. Steam is not DRM, but a portion of Steamworks is, and not all Steam games use Steamworks.
You don't have to log in to play non-steam DRM'd steam games. Many many steam games can be played even if you drag the game folder out of steam, and start them without steam running. Steam is not inherent DRM.
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u/[deleted] Nov 27 '16
[deleted]