I think they’re referring to the flash plugin itself. It enabled a vast amount of creative work and it enabled vast exploitation of users’ browsers. I worked as a tech at a consumer-focused computer store from about 1999-2005. It was a wild wild world back then. The vast majority of our time was spent removing viruses, browser toolbars, Bonzi Buddy and friends, and helping people understand how their online banking passwords got stolen by the shady porn site they like so much.