Because Braavos and Volantis (and Pentos) also make use of pirates and/or sellsails (and the difference between them is about as clear as between pirate and privateer).
Just a backup in advance of the detumblring
Because Braavos and Volantis (and Pentos) also make use of pirates and/or sellsails (and the difference between them is about as clear as between pirate and privateer).