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But if you can access to information from an exchange halfway across the world faster than others, you can definitely trade on that.

And if you can break the speed of light, you don't need a second exchange.

It’s quite easy to “break” the speed of light in fiberoptic glass.

But it's not that useful even if you pour a glass cube over the whole exchange to slow it down.

> It’s quite easy to “break” the speed of light in fiberoptic glass.

I don’t understand this, why? Does light travel faster than the speed of light in fibre optic glass?

"the speed of light in fiberoptic glass" is the thing being broken.