I don't have an answer, but the theme that's been bouncing around in my head has been about accessibility.

Grok makes it trivial to create fake CSAM or other explicit images. Before, if someone spent a week on photoshop to do the same, It won't be Adobe that gets the blame.

Same for 3D printers. Before, anyone could make a gun provided they have the right tools (which is very expensive), now it's being argued that 3D printers are making this more accessible. Although I would argue it's always been easy to make a gun, all you need is a piece of pipe. So I don't entirely buy the moral panic against 3D printers.

Where that threshold lies I don't know. But I think that's the crux if it. Technology is making previously difficult things easier, to the benefit of all humanity. It's just unfortunate that some less-nice things have also been included.

I think a company which runs a printing business would have some obligations to make sure they are not fulfilling print orders for guns. Another interesting example are printers and copiers, which do refuse to copy cash. Which is partly facilitated with the EURion constellation (https://en.wikipedia.org/wiki/EURion_constellation) and other means.