If you read the whole thread, there are many people with "dropbox only" e-mail addresses that are being spammed, including some that are claiming that the address does not include the word "dropbox".
Are these people aware of the Rumplestiltskin strategy? dropbox@, linkedin@ both fit that, but what about the other addresses? Unless your e-mail address resembles what's currently considered a Strong password, you're going to get spam.
