This is a strange take. Yes, both morality and ethics are intrinsically tied to there being existing agents interested in them. But once you establish that those agents exist, saying, "there is no such thing as morality and ethics" is nonsensical.
I think the words such as right or wrong and moral, ethics are made up to control people. These ideas are always changing depending on who controls the narrative.
I would love to hear what you think. I have a strange mind and I'm just trying to understand and learn.