Take for web for example. It is trustless in the same manner. There is no third party (apart from the web browser and the server) that you need to trust in order for you to view a web page. There is no International Web Organization that you need to procure permission from in order to set up a web server. You just start it. (And, conversely, also why so much bad actors exist on the web.)
This is fundamentally a different system than for example all economic transactions, apart from cash. This is why some people argues against the cashless society for not being trustless, and also what the people who experiment with private monetary systems study.