I think the first step is the same as for anything else. We would never have produced drugs or cars if we didn't understand how they worked. Drugs are tested on rats before they're tested on humans. Here, we have a model tested on 800 million users who can decide what to do with it. There is no doubt that some people will have ideas about child pornography or uses that we could not have anticipated.
As you say, it's extremely difficult to put the toothpaste back in the tube. However, we now know the effects and could take the model off the market. We don't know how it will be used by humans or what the long-term effects will be. We're still seeing it on social media. I think studies have to be done before the technology is launched.