Making GPU’s and CPU’s that are *good*, is very difficult.
By good I mean fast and power efficient.
Also some technologies that are almost vital to being widely used are only licensed from the big guys (instruction sets)
Another company (that would be a rival) would need to have the money to pay for the licensing, and money to develop and get good at developing (operating costs) in order to have any hope of succeeding.
That would be a large amount of money and time to risk, for a small potential gain.
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