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Isn't thwre a single one RISC-V capable production line in the US? Imagine if Apple starts their own chip production.
There's a reason TSMC does most of the world's chip fabrication.
It's complex and extremely expensive. Standing up a fab, in America no less, capable of handling Apple's demand would be an astronomically expensive feat. Apple would never do this while TSMC is still an option. Even after the tariffs it would still probably be cheaper to use TSMC.
TSMC is for bleeding edge chip. 10nm and above are produced everywhere. Mostly 28nm, since it is the cheapest. It won't be easy to build 5nm fabs but I bet still doable.
Also let's be honest, unless the tariff is applied to everyone it's gonna be cheaper to use another country as a middleman to trade with with China.
There are throngs of people already at work to find out how to gouge consumers by blaming tariffs without actually paying any.
Apple would probably produce ARM chips. They wouldn't want to change architecture again so soon.