Those aren't toys.
They're real cars, made to look tiny by blurring everything outside a narrow band.
Selective focus mimics the very shallow depth of field you get in close up photos of small objects, so the brain reads a full size scene as a model.
A tilted lens can put that sharp zone at an angle across the frame.
My favorite use is pure chaos, like a demolition derby, where the toy look makes the wreckage oddly cute.