They have the infrastructure in place already. They invested in building several wafer fabs of various sizes and they coordinate fairly well. If your part only requires a 4 inch line, they can accommodate you. If your product works better on a 16 inch line, they can take care of that as well.
They grow their own silicon and have been doing this for long enough that the process is well understood.
It also helps that their laws regarding the use of hazardous chemicals such as phosphene and diborane amongst others tend to support industry.
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