Based on how many games using only the in-built DRM in Steam are cracked I'd guess that "lock-in" is really not that big of an issue, if at all. Other DRMs are

Based on how many games using only the in-built DRM in Steam are cracked I'd guess that "lock-in" is really not that big of an issue, if at all. Other DRMs are far more invasive than the Steam DRM.