Why? Is it because of cost? Perhaps nepotism? I don' see a reason why Amazon or Azure would be passed over in favour of Oracle. Why wasn't GCP a contender either? Something seems fishy... someone from Zoom care to chime in? Maybe they are afraid that Amazon or Microsoft with their tradition of copying competition would pose a threat? Even then, Microsoft is already competing using Microsoft Teams and if Amazon wanted…
We argued against it in the dev team, but it wasn't the worst cloud migration I've done. The console reminds me of early days AWS as it's essentially just VPC+EC2+S3, but it was refreshing to spin up a server without a pages of config being presented to you. We took the opportunity to containerise our older sites and ran everything in their managed k8s cluster. I very rarely had to use the console for anything, which tbh is a bit of a grab-bag of managed services beyond the core cloud offering. Terraform support is there if you need to do anything serious.