I'm not arguing that it's generally and automatically ok, I'm just saying that it's probably also not right to see it as entirely and inherently immoral, and that some people are probably fine with their contributions to the public domain being used in it.

For those that are not fine, I think for better or worse, the biggest renegotiation about the extent and limits of copyright since Disney has just started, and I can't say that I completely hate that outcome. (I do find it quite telling that this is what it took, though.)