Because it does work.
It is controversial because there was a double-fuckup in both the reporting, and in the response from science professionals. Because of the double-fuckup, the truth is so embarrassing that if you have letters next to your name and speak of the truth, you get blackballed from all STEM fields.
Basically, what happened was, there was a successful experiment. But it hadn't been repeated yet. And the media went apeshit, and famous people said all sorts of wild things about flying cars and the future from the Jetsons.
And then others tried to replicate it, and they failed. And the whole world, all the idiots who originally were talking crazy, plus all the ones who had been sagely insisting to wait and see, they all then came out at once with the bigger fuckup than the first one: Everybody started calling it a hoax, and blaming the original scientists.
And then in the period after that, for a couple decades, even talking about the research in a serious tone of voice got real professors fired. That's how bad it was, that is how bad it still is. Talking about it seriously is forbidden. By "scientists."
But it wasn't a hoax. It quite realistically might not have been a mistake, either. Because while most who tried to replicate it failed, a few, maybe 1 in 40, were successful. Once. But then not the next time. And so it turns out, it sometimes seems to work. Or if not, the actual experimental mistake has not been discovered. But it really appears to sometimes work. Of course, 1 out of 40 tries means it is a huge net loser of energy, not a power source. But there very well might be some important physical law or fact or whatever that is deeper and simply not understood; some inner clockwork that remains totally hidden to us that determines if it is ready to work or not. Discovering why the experiment usually fails would be absolutely huge, the biggest discovery across 3 generations of physics. But nobody in academia is allowed to talk about it, because falsely accusing scientists of perpetuating a hoax is a major anti-social transgression. And many, many people have engaged in it, and have already helped to blackball people over it, so they're all invested in the "conspiracy." But of course there is no intentional conspiracy, it simply works out in a similar way when so many people have the same malicious interests in play at the same time.
So anyways, if some company does the research instead of discovers something, it will probably have huge engineering implications. Whatever it turns out to be. Doubtful it would actually be a useful power source, of course.