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It's less to do with hiding data from the public and more along the lines of controlling the data so that no one in the company gets it before the public (and thus allowing said person inside the company to trade company stock on insider information).

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Isn't this solved with trading windows, which you only open up right after earnings calls? Or am I missing something?

Those don't apply to the general public. The problem is insider gets info -> calls his brother-in-law -> brother-in-law trades on early info. Illegal, but lucrative.

If you're classified as an "insider" then you can't even trade in the trading windows without a 10b5-1 plan.

So at TWTR (I'm a former employee) knowing things like the MAU would probably make you an insider, which means you can only sell on a plan.

Not knowing the MAU is a blessing in this case.

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