I'm no math or physics genius but one thing seems obvious to me. In order to flex the screen, the product image shows 3 main contact points: the center and then an arm contacting the 2 side edges. This is similar to having a material subjected to a load applied transverse to the long dimension. This naturally causes the member to bend, similar to how a wooden board on a scaffold with someone standing in the middle would gently bend. When bending the structural material in this manner the resulting curvature is takes on a parabolic distribution, and not a circular one that many may expect or want. This assumes that the material of choice backing the panel (presumably some kind of plastic), has an even coefficient of strength applied across the width. This may or may not be addressed in the marketing of the product, but I wanted to point that out since that can make the curve a bit more V shaped rather than C shaped. But like I said, I'm no math or physics genius.
We haven't ruled out engineering genius, though.