Funny how it took the music industry a long time to come to that conclusion (that DRM is useless), but every other industry insists on making the same mistakes again.
Videogames dealt with piracy and DRM way before music, movies and books, and DRM is very much alive there. The only significant change in DRM usage in videogames is due to the shift to service-oriented games (multiplayer, updates, events, etc).
One of the differences with video game piracy (at least a few years ago) is that video games tend to have a short window after release when they make most of their sales. Everyone in the industry knows that a game will be pirated eventually so DRM is seen a way of delaying the availability of pirated version of games to maximize that window of sales.
Obviously, this varies with publisher, studio, and game, but that was the rationale I heard when I worked in the industry.
Kinda like parents and children, I suppose.