Yes, it is to a large degree AMD's fault, but NVIDIA also actively acted maliciously by neglecting OpenCL support, which meant that during the critical time 5-6

Yes, it is to a large degree AMD's fault, but NVIDIA also actively acted maliciously by neglecting OpenCL support, which meant that during the critical time 5-6 years ago, there was no realistic chance for the open alternative to succeed. While developing a small competitor to Tensorflow back then (Leaf), we were one of the few frameworks that also tried to support OpenCL, but the additional dev work made it unfeasible.