Taiwan-based TSMC, Bitmain's main chip supplier, experienced a massive downturn in demand for cryptocurrency mining chips in 2018.
source https://www.google.com/url?rct=j&sa=t&url=https://xbt.net/blog/bitmains-chip-supplier-tsmc-saw-a-big-drop-in-its-cryptocurrency-mining-sales-in-2018/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNGsO6db1gm9Z0DvXl9BrNaTWb-jng
