According to Bithumb, the 0.55 Ethers (ETH) that incurred a $2.6 million transaction fee ended up in one of the exchange’s wallets.
Earlier today, someone paid 10,668.73 Ethers in gas to move $134 worth of the asset from one wallet to another. For comparison, today’s average gas price is $0.34. The most natural assumption is that the sender must have made a mistake.