The main reasons of "monopoly" are long-term vision and enormous effort spent in software development. AMD is lacking behind because they have not yet seriously invested on their own software stack.
People pretending to do professional work with low budget/quality workstation. If you cannot afford to operate a 4090 according to specs, you cannot blame NVIDIA if things go wrong.
You blame CUDA because you have never played AMD + ROCm. Furthermore OpenCL is on dead-end street. With standard programming languages natively supporting CUDA, it has no sense to add extra layers.
The most powerful and unfortunately unusable supercomputer of the world. AMD's approach to GPUs is on a failing track since its inception. The only software stack available is super fragile, buggy and barely supported. Rather than building a HPL machine I would have preferred see public money spent in a different way.
This not completely correct because while a carrier transport anything indescrminately, social networks manipulate and control information exchange, for instance giving more priority to a content wrt to another.
In terms of PCI lanes efficiency, there is no competition between Intel and AMD. Intel is much ahead wrt AMD. Don't not be impressed about number of lanes available on the board.