Actually I have, most of my employers and clients the past few decades have 80k++ employees. I understand that there are PLENTY of interfaces on a company on the size of Vodafone (let's call them that) that have live access to networks, infrastructure, and what have you (e.g. Huawei, Nokia, Ericsson to name the big whales) and myriad other smaller ones monitoring, fixing, live, a million moving parts.

The responsibility and accountability remains though. I do not accept the 'we are big and busy so we drop the ball'.