The Firebird
Adventurer
What do you mean by 'search engine'? Does it just give you web pages, or does it just answer questions by rephrasing either search or internal data?As a search engine? Assuming the source data was open and free, at that point its just a more 'natural language' version of google, that pretends its a person as it serves you the answer right? Ethical at that point? Sure.
If however, it crosses into 'tell me a story Hal, and draw me a picture while you are at it' and that story and art is then sold? No, I think at that point you are not ethical.