Hetzner works because it was built a long time ago when talent was cheap, which it was because the property Ponzi wasn't at the stage where an average post-tax middle-class salary barely covers rent. Since then they've managed to stay afloat because it's only maintenance and small incremental changes from that point on.
Building such a new operation (and offering competitive prices) from scratch today would be impossible based on labor costs alone. This is presumably the same reason they don't offer their very-good-value dedicated servers in the US either, only "cloud" VPSes which are orders of magnitude more expensive.
The cost of hands and housing for hands, yea thats marginal in this.
By your logic AWS should also be cheap since it was also built under similar timing.
Hetzner is cheap because they don’t provide the same level of abstractions. They also have competitors in the same price range. They aren’t wildly unique.