Some useful context: Zoom also runs 17 of their own data centers in addition to using AWS and Azure[0]. This deal is to run their "expansion" on OCI. Hard to say what that means exactly, but it doesn't sound to me like Zoom is making a big bet on OCI. [0] https://www.cnbc.com/2020/03/18/zoom-cfo-explains-how-the-co...
A google search confirms that they colocate, apparently with Equinix. This is as far as running a data center as living in an apartment is to building and managing apartment buildings.
(Fun Fact, while Amazon does own and run its own data centers in most places, they're also colocating with Equinix in some regions (though I assume their level of colocation goes beyond traditional colocation)).