The "1h Attack Cost" is calculated from the rentable hashrate from NiceHash, but you should pay attention to the "NiceHash-able" column that says how much hash you can actually rent.
While you'd think you could attack Ethereum for only 1.5 million dollars, you can only rent 7% of that hashrate, so you can't get the required >50% you'd need to pull of the attack.
Perhaps I misunderstand the table in the article or the impact of a 51% attack however.
This is why a reasonable size of the state, to allow many many to have affordable nodes which validate and check the rules, is so important. These are not the so-called miners, yet they are critical for the integrity of these distributed systems for preventing nation-state attacks.
Is this 7% per customer or aggregate per blockchain? Ie could I set up a dozen or so companies to each have a few percent of NiceHash and obtain the 51% that way?