It’s a morally grey area. I believe that so long as you aren’t using it for profit or in a distasteful way, it’s permissible. In other words, as long as it’s something being done out of passion for an intellectual property, there’s really no harm in it. But I can’t blame somebody for being uncomfortable about it. I just don’t think that somebody else’s discomfort gives them the right to pass a judgment about the topic for everybody as a whole. It’s a personal thing because of how grey it is.
Maybe one day there will be laws passed about this. But those are never retroactive. For now, it’s the wild west, and it’s up to the people to make sure they’re using these tools in respectful way.