I think you're giving the reporter too much credit :)
Also, Atlassian is a good deal bigger than GitHub (if measured by revenue, profit, people or valuation), which would seem to put them on the Dropbox side of the analogy
I think the Bitbucket piece is smaller than Github. But Atlassian also have a whole bunch of enterprise-oriented products, more in the same kind of market as Thoughtworks or one of the big enterprisey lots.
Also, Atlassian is a good deal bigger than GitHub (if measured by revenue, profit, people or valuation), which would seem to put them on the Dropbox side of the analogy