If they were watered down, I wouldn't see any moral or ethical loss in that.
I'm also far more amenable to dismissing copyright laws when there is no profit involved on the part of the violator. Copying a song from a friend's computer is whatever, but selling that song to others certainly feels a lot more wrong. It's not just that OpenAI is violating copyright, they are also making money off of it.
So it is not good when people use copyleft as a justification for copyright, given that its whole purpose was to destroy it.