Ziggy Stardust said:

Aw man! I wish I could see some Banksy stuff around where I live!

By MBW being a Banksy creation, what do you mean?

Many, including myself, believe that Exit Through the Gift Shop is a Kaufmanesque performance piece/inside joke in addition to being a documentary. I think Mister Brainwash is a character created by banksy and Thierry Guetta meant to satirize how movies, music, fashion, and advertising copy street art and street culture to make money, all the while pretending that they're the real innovators.