Closer to $40b for a new fab for an established company to do it all correctly. It's a much more major investment to open a fab without ever doing it before, then continually use the brain power/institutional knowledge you've built up to stay near the forefront of fab tech, and then basically have weird incentives to build a foundry for only your products rather than the world at large.
You're setting yourself up for making a huge part of your future revenue stream being set aside for ongoing chipfab capex and research engineering. And that's a huge gamble, since getting this all setup is not guaranteed to succeed.
Is that true? I guess what I mean is, is it $40B if you are trying to replicate the scale of a TSMC fab? Or could you do it for considerably less if the fab is initially designed to the needs of single customer (Apple)?
Closer to $40B for some of the latest fabs from TSMC you're seeing, yes. While there could be huge simplification in SoC and packaging processes if it was focused on a single product, Apple's needs will likely still be about having cutting edge processors, so it would still be pretty high even if they were to just buy TSMC.
