Re: Why am I not surprised?
Zoom grew quickly so it's entirely possible that they started with Oracle - they were certainly cheap for a while.
But Oracle doesn't have the footprint of AWS so some services were moved to AWS. Then we see the PR people playing silly games.
And finally we have Azure being used for some functionality, I would speculate due to licensing advantages.
Now we just have to wait for Oracle to throw up their white flag, refuse to move to AWS/Azure because of on-going spats between Larry and others and all Oracle customers end up in Google to complete the set.