As mentioned in the blog post, payment services also commonly allow user enumeration, including Paypal, Venmo, Square Cash, and others.
The reason you don't see it with banks is that they don't allow you to send money to an email address.
The reason you don't see it with banks is that they don't allow you to send money to an email address.
If I were a criminal blackhat would be nice to have user enumeration to confirm names on Coinbase so I could send personalized wallet stealing emails pretending to be from Coinbase.
The question is not for sending money but receiving or requesting money. I personally can't think of a single benefit to getting this information at time of requesting funds.
As a matter of fact, if the name was enumerated when sending money that would to some (very small) degree be acceptable as the sender stood to have a financial loss.
edit: grammar
I suppose you could send e-Transfers to random email addresses and then see if any are accepted, but that would cost you an absolute minimum of $0.01 per attempt and would probably have a terrible response rate.
Source: this is my day job.
Edit: sorry, forgot to mention this is Canada-specific.
Source: I live in Australia