What's surprising is that copying a product cadence seems like an easy thing to do. Any of their competitors could have made minor improvements / bug fixes to their products and released a new card at every conference as well, so why didn't anyone else do it?
There was a tile-based rendering chip startup that was also making waves around that time. I forget their name. IIRC they got bought out for their patents, and their architecture is very similar to what the Apple Silicon gpu does.
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These early efforts to use GPUs as general-purpose processors required reformulating computational problems in terms of graphics primitives, as supported by the two major APIs for graphics processors, OpenGL and DirectX. This cumbersome translation was obviated by the advent of general-purpose programming languages and APIs such as Sh/RapidMind, Brook and Accelerator.[8][9]
These were followed by Nvidia's CUDA, which allowed programmers to ignore the underlying graphical concepts in favor of more common high-performance computing concepts.[