While Uber may be interested in the "fraud" aspects - and I think that's a harsh word for what is "walk 50m from drop location" - it really ought to be up to the user to decide what the drop pin should be. Especially when it comes to uber-pool rides, riders may not want to disclose their residence or other locations to random passengers. The only thing that should matter is whether the rider got off at the dropped pin, and not whether the rider walks to some other place.