If by sabotage, you mean they develop a technology to run on their GPU efficiently... then release the source code so NV can, with some time, optimize it as well.. yeah. No didn't think you meant it that way. Because these days, AMD GE games like Far Cry 3, Crysis 3, BF4, Tomb Raider and the lot of them, run equally well or better on NV GPUs.
There's zero incentive for me to go with AMD GPUs over NV GPUs for this reason alone now, because NV GPUs will run GE games just fine (maybe a patch or driver update required, but they can optimize it easily with source code provided!!). AMD GPUs will continue to run NV games like ass..assin's Creed (@S.H.O.D.A.N. CF R290X should obliterate ACU), needing many months and many patches to be 25% behind. I've come to realize it very recently, especially with Witcher 3 & GTA.