Lets compare this to Nisei MK II.
Viral Weaponization trashes the runner's grip, taxing them ~5 clicks. It also has the side benefit of disrupting their game plan. Nisei MK II, when used on a scoring server, would cost the runner a click and a massive amount of credits. It can also open a scoring window.
Edit: There are cases where removing the cards in the runner's grip is better than ending the run, such as hurting the runner's tempo or as part of a mill deck.