Quote from Elaine in The Finale
Soup Nazi: But the idiot clowns did not know how to order. I banned that one, the woman, for a year. Then one day, she came back. [flashback to Elaine gloating about having the Soup Nazi's recipes] Soup Nazi: She published my recipes. I had to close the store and move to Argentina. She ruined my business! Elaine: His soup's not all that good anyway. Soup Nazi: What did you say?!