The incident, which some analysts are calling Amazon’s worst outage since 2021, reminded the world of the perils of depending on a handful of cloud companies to deliver crucial computing and internet services. Outages like Monday’s strike at a core premise of the cloud: that a centralized operation full of sharp engineers will keep servers running better and more efficiently than individual companies’ own staff. The breakdown occurred at a challenging moment for the Amazon Web Services cloud unit, which has long touted reliability and accountability as a core piece of its pitch to customers.