Thanks to Intel and AMD.

NVidia never even implemented OpenCL 2.0

AMD had a buggy version. Intel had no dGPIs so no one cared how well an iGPU ran OpenCL (be it 1.3 or 2.0)

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AMD was clearly pushing C++ AMP at the time with Microsoft. And IMO, it worked great!! Alas, no one uses it so that died.

Don't blame NVidia for Intel and AMD failures to support OpenCL.

Olympics-tier mental gymnastics, considering Apple treated both Intel and AMD as manufacturing partners at the time.