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.25% of 247 million is $617,500, not 60 million

I Am not sure if all of transaction volume is subject to fees. Market makers get a discount, or can even do it for free, and part of their larger customers might be other exchanges which would get similar discounts.

247 * 365 * 0.0025 = 225,387,500 / year. How is that 1B?

$1B in revenue sounds reasonable, seeing as there are higher volume days than just yesterday, and those trading revenues don't include revenue from fees on (non-GDAX) Coinbase buy transactions.