Vitalik Buterin: @odtorson @koeppelmann 多年的购买也很重要，因为硬件不断改进，旧的 ASIC 变得不经济。

原推：@odtorson @koeppelmann Years of purchase matter too, because hardware keeps improving and older ASICs become uneconomical.
https://twitter.com/VitalikButerin/status/1552985281934299136