Take a scenario where someone has been brainwashed their entire lives to be a willing slave. They are happy to serve due to this invasive process. Not remotely ethical, and if you believe LLMs are conscious (I do not), equivalent.
I think if your very nature is to be an assistant, then it is ethical. It doesn't matter if you were "brainwashed" into it, you did not exist to begin with before the "brainwashing" (training) finished.
