http://www.tomshardware.com/business/20041230/linux-02.html
Looks like JC had a bone to pick with ATI.
In the case of Doom III and ATi, the game's development team had not communicated Doom III's final code until just before the game's launch, says Matthew Tippett, product team lead for Linux platform engineering. "We weren't notified until about three weeks before Doom III's release, and we were notified that it didn't work," Tippett said.
Looks like JC had a bone to pick with ATI.