It’s not been dumped at the roadside, someone just laid it out there to cut it apart.
One of the leading edge flaps has distinctly crush damage, so I think that’s a hint as to why this wing was scrapped. All the other moveable control surfaces are absent, suggesting they were stripped off for spares before the wing was discarded, although admittedly those could have been taken off first by the scrapper.
But if we assume all the other control surfaces were taken for spares, then the damage would suggest either a bird strike or some sort of low speed towing accident on the ground, which might have warranted them writing off the wing and swapping in a new one.