There's an underappreciated comment in the other thread about SynthID and OpenAI [0] that captures what (IMO) the hacker ethos on this should be. We care about privacy, we should not accept tools that barcode our every digital move. (note that the counter of "well, they don't do that yet " is not particularly convincing) [0]: https://news.ycombinator.com/item?id=48200060
The Hacker ethos is mainly about how things work: sharing, openness. I'm not entirely sure how hiding that something is GenAI fits in here. It surely doesn't have anything to do with Privacy though.
I think ethical considerations were always a bit secondary to technical power when it came to so called "hacker ethos".
After all, instructions on how to remove watermarks definitely feels like the sort of thing that would have been in phrack back in the day.