What's another explanation for this huge fee? Your reasoning makes sense, but that still leaves me extremely curious.
Base Fee Per Gas: 0.000000058907049227 Ether (58.907049227 Gwei)
The paid gas fee for the transaction is: 0.053243669870735422 Ether (53,243,669.870735422 Gwei)
Perhaps they wanted to post the transaction for 53 Gwei but fatfingered it? Or entered Pwei instead.
Edit: This block was apparently mined by poolin pool: https://minerstat.com/coin/POOLIN-ETH
Their rewards almost doubled
("Fat finger" errors like this are not unheard of in the read financial system, but that usually allows reversal)
Anyway, be your own bank, I'm sure you can figure this out. /s
Yes I'm sure it's purely coincidence that the "random on the street" who mined this block is a major Bitfinex shareholder.