Clearly you don't read, or don't comprehend when you do, so I'll keep it short. They have, there are, and they are.
Then it should be easy for you to answer without being a nitwit.
Of course if all you do it post a vid and then condem people who question it i am pretty sure that......
1. You are once again not considering Distinctions and Details. (same old story with you)
2. The vid probably didn't cover actual costs in detail, they probably said something like "It will pay for itself" and you swallowed it like a teenage promise.
3. There isn't actual "investors". Meaning people with real investment capital pushing this forward.
4. The technology is probably in the development stage still. Meaning it works, but hasn't been fully tested, maintenance costs determined, wear and tear, environmental impact, etc.
Let's just rail on like we think we know what we are talking about because we took the time to watch a snappy video.