HN commenter, paraphrased: "HFTs pay brokerages money to see non-executed limit orders! That's outrageous." Literally anyone can pay a trivial amount of money to see non-executed limit orders on the order book at a stock exchange, which exists in large part to do exactly this.
I also think that the sentence which begins "Formally," is probably wrong as written, but that depends on market microstructure issues. Can you guarantee absolute synchronicity of Chicago and New York's clocks, for example?
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If I am capable of waving a magic wand which wins auctions in 1 microsecond and you require 25 microseconds, and there is 2 microseconds of clock skew between New York and Chicago, I will outcompete you 100% of the time regardless of whether auctions execute every 1 or 100.
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