This is the radical part. "Free" removes the barrier between the player and the fall. When a game costs money, death becomes frustrating. ("I paid $70 to lose my character?") When a game is free-to-play done right , death becomes tragic but fair. The player owns nothing but the memory of the run.
"See?" Thrum muttered, pulling himself along the wall. "Death was free. The loot he had on him? That belongs to the blades now." dwarves glory death and loot free
DIG. DIE. GLORY.