The mining hardware made by Bitmain uses the latest high-end fabrication nodes from TSMC. How much TSMC's manufacturing capacity is used by cryptocurrency is unclear; the number is hidden inside the high performance computing segment in TSMC's financial statements. But it is probably a sizeable part.

Since this model is mining with "free" power, it seems like even less efficient hardware could still be used profitably which would extend the depreciation (and reduce e-waste concerns). They might even buy used miners that are considered too inefficient by other companies.