Sydney has no genitalia, no hormones, no sex drive. It does not "desire" someone. It may have a theory of mind, but clearly any AI saying that it loves someone is just working from its training data. The article treats this as though there was an actual intention there, rather than just a model repeating its training [0].
Just as obviously, this is a journo playing to our human desire to prevent aliens from running away with our women - any thought of non-humans breeding with humans triggers something pretty deep in us. Well played, sir. Take your paycheck, sit down, and please stop pushing the buttons.
The AIs are not going to take over the world in the sense that this article talks about. They are not invented by supernatural forces beyond our ken, as it suggests. This is a human emotional reaction to things that appear to be intelligent. I agree that this generation of AI is going to hit a brick wall and the shortcomings will become obvious, but the emotional reaction will be the same. I think it will be another 10-20 years before we solve some of the technical challenges in this generation of AI. But we're having the discussion about AI, and the emotional reaction to it, now. Which is probably good, because by the time we develop actual AI we'll have been living with our current level of "almost-AI" since we were kids and we'll be used to it.
And to answer the question: Every technology is dangerous. That has never stopped us from using it.
[0] Though, of course, that raises questions about what an "intention" is in human terms, too. Are we just "repeating our training"? I think not, at least for sex & love - there are too many hormones involved.