The people were using these mods to help them survive in the video game.
Ainz Ooal Gown was overconfident, made the mods quickly, kept them short & limited, thought that no one would dare attack those using his / their mods, but at least one person who was using his mods started getting attacked.
This is how the Wikipedia describes this short film:
Slaughterbots is a 2017 arms-control advocacy video presenting a dramatized near-future scenario where swarms of inexpensive microdrones use artificial intelligence and facial recognition to assassinate political opponents based on preprogrammed criteria.
The video was released onto YouTube by the Future of Life Institute and Stuart Russell, a professor of computer science at Berkeley, on 12 November 2017.
The video quickly went viral, gaining over two million views.
The video was also screened to the November 2017 United Nations Convention on Certain Conventional Weapons meeting in Geneva.