It seems to me that if there were as much of a customer base for custom ICs as there is for PCBs, a fabricator like TSMC could easily offer a batch prototyping service on a 28 nm node, where you buy just a small slice of a wafer, provided you keep to some restrictive design and packaging rules.
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Why?
It seems to me that if there were as much of a customer base for custom ICs as there is for PCBs, a fabricator like TSMC could easily offer a batch prototyping service on a 28 nm node, where you buy just a small slice of a wafer, provided you keep to some restrictive design and packaging rules.