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Re:A veteran programmer explains how the stock market became... by yummyfajitas on Monday April 07, 2014 @08:34AM (#7546077)
The most charitable interpretation of that quote is that after RegNMS, multiple trading venues became legalized. Liquidity providers then chose to spread liquidity out because it was now legal.

Here is RegNMS. Find me a place where it says liquidity must be divided between all possible exchanges: https://www.sec.gov/rules/final/34-51808.pdf

Re:A veteran programmer explains how the stock market became... by ubernostrum on Monday April 07, 2014 @09:09AM (#7546237)
If you believe the description in the article is wrong, then as I said your problem is with the article.