The popularity of the WASD configuration was basically popularized by one Quake player Denis “Thresh” Fong who won Romero’s Ferrari at a quakecon in 1997.
https://www.pcgamer.com/how-wasd-became-the-standard-pc-control-scheme/
From then on the WASD configuration become widely adopted and then subsequent generations of FPS games (SIN, Half-life) used that as a default making it the norm.
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