Downhill skating

I suggest making covering a sloped area with ice. I will be like downhill skiing but with skates instead of skis.

It means areas that are too flat for downhill skiing can be used.
It means areas with sub zero temperature but no snow can be used.

Why not make skate boarding ramps out of ice? It would be like a mix of a skate board ramp area and a half pipe.

The danger of people skidding with sharp blades and uncovered throats springs to mind. But is it really a problem? No one talks about slalom skis and sharp sides. Nor have I heard anyone discuss it when ice skating.

Difficult to create such a slope? I guess we have to learn, just like we have learned how to prepare for skis.

Update

The other day I stumbled upon some sort of this. It was just a few seconds on youtube and it looked like a smaller variant of the sport where they go 4? people next to each other over bumps.