Comment by filoleg

Because Steam is DRM done right (in terms of ease of use). With Steam, you just press a button, and the game is yours to play. Zero friction.

99% of the time DRM is used, it makes the product less convenient to use by people who bought it legally, as opposed to those who pirated it. An example that comes to mind, all those blu-rays with bajillion of warnings and ads before the movie starts vs. just watching the movie right off the bat without any ads or wasted time if pirated. Don't even get me started on Denuvo or any other video-game DRMs, those are creatures straight out of UX nightmares.