Abrash handed over a lot of Valve IP and prototypes to Oculus (note: Gabe did not object) before himself joining Oculus. Oculus did their VC demos at Valve on Valve hardware. I think gabe was hoping that oculus would put all their games on Steam. Didn't work out that way :-)

Still, my comment was semi-flippant; Valve is no lawsuit monster and even if they were inclined to sue, they surely would have done so by now. But there were quite a few unhappy people at Valve about how that went down, and IMHO the Vive is in part a this-is-how-you-really-do-it fuck you to Oculus.

In any case I feel like this is simply an opportunistic deep-pocket-reaching lawsuit against FB.

PS: don't know why my original comment was downrated.