> They never asked for your permission, don’t even start asking for theirs.

Correct, Banksy never asked permission before shoving his advertising in my face.

http://news.bbc.co.uk/media/images/45894000/jpg/_45894102_un...

http://www.brooklynvegan.com/img/music2/BV_Screening_Invite....

Happy enough to use the system when it makes him money.