I agree that 1000+ people may not be "large-scale" depending on how we define it, but I do see it as a proof of concept that Coinbase permits large-scale user enumeration. (Not that it has necessarily happened yet)

Yea ok, I got your point :)

Now we just need to make sure the data came from coinbase directly, which they refute. They say data comes from other services - mostly bitcoin related ones.