Why do you ask? What change in your own behaviour would the different answers elicit? Is this just an intellectual exercise? In that case, it's a reasonable

Why do you ask? What change in your own behaviour would the different answers elicit? Is this just an intellectual exercise? In that case, it's a reasonable question that might lead to an interesting conversation. Are you thinking of working for one, but worried about how you would feel? In that case, I don't think any amount of reassurance from internet strangers would help. Are you worried about how others might view you if you have it on your CV? That may be a valid concern, but in that case, it's an XY problem. Are you looking at a pile of CVs, and thinking about whether to reject someone on these "ethical" grounds? You don't know what predicament caused the candidate to take that job, or to (want to) leave it, or the exact nature of what they did there. If you work on technology that can help to identify harmful play and intervene appropriately, then you are probably creating technology that makes the world better, even if you are doing so for a company whose other products may be making the world worse.