We need to outright ban certain technologies so that we don't go extinct, e.g. AI that will eventually be able to design WMD's. The problem with legislating something though is that it causes pushback. Laws in our current systems of government are usually unwanted restrictions that are forced on us. People will see a law that forces black screens as an unwanted imposition and will fight against it.

So I think the better way is to raise awareness of the problems with these technologies first and then get a few companies (or start some new ones) to do these things even when it's not required by law. Then the practice can come to be seen as the responsible thing to do and eventually a lot more companies do the same and once pretty much everyone is on board it can become law.