I think they're probably tied up in public relations hell. They are too big and too brand protective to risk launching something that has even the tiniest chance of producing content they could get slammed for. They're likely spending all their time on adding layer upon layer of moderation to prevent that from happening. It would be better to just ship and get ahead of it by doing a demo that contains a weird response and use that as an opportunity to educate people on what they need to be careful of when using the tool. They could spin that into them being honest and having their user's interests at heart. Unfortunately, they also have to worry about what their advertising partners think which is the bigger problem.