A 51% attack can only reverse a transaction anyway, it can’t arbitrarily take money from someone you haven’t transacted with. But they could get short exposure

A 51% attack can only reverse a transaction anyway, it can’t arbitrarily take money from someone you haven’t transacted with. But they could get short exposure to btc/eth in the market, profit when it went down from the ensuing panic, and then sell the graphics cards to retail (there are other complications that make this unrealistic, of course.)