I use open source software from centralized trusted software repositories (which were the spiritual precursors to app stores)—I don’t need to hunt around on the Internet to find some software whose source I do not know. Does it have a virus? Does it have a trojan? Will it send all my purchasing, credit card details, photos and other identity to some unknown third party? What I get from the centralized repositories constitutes my base web of trust—and that base web offers a collection of software so large and varied that I know I can get a tool for any job, be it office, media, programming, scientific or leisure, and more.