>like they're being hoodwinked somehow

Because they are. It would be like if I bought some trinket off aliexpress and told you I made it by hand just for you. You wouldn't mind if you bought it yourself, but the fact that I lied about it to make it seem like I care is deceptive and immoral.

Sending someone AI generated text without disclosing so is incredibly offensive. It says you don't care about wasting the receivers time and don't care about honesty either.