They could ban the manufacturing of anything with an ARM core, in China, in the extreme case.
https://indianexpress.com/article/explained/apple-india-manu...
Samsung's somewhat exceptional in that they have a lot of domestic high end component manufacturing. But even they've been increasing Chinese manufacturing via ODMs for lower end models while media was talking about their move to Vietnam. I think their high end models still sources ~30% from China.
SMIC produces lots of chips. But if China tries to clamp down on ARM production, it will hurt TSMC.