Entertaining people is useful! In my opinion, it is probably one of the most ethical ways to make money. I think game development is in that category too. It is a very pure field where you are giving a consumer something they enjoy and seek out.

Ethical all depends on if what you are doing is really you. Whether you are being you. The same way with any creative pursuit. There is a significant difference between creativity for creativities sake and creativity marketed to exploit.

Do you mean authentic?