Amazon - self made Microsoft- Arista and Cisco Google - Cisco and white box FB - self made (wedge) OCI - ?? Is this true information ..
Does amazon make its own switches ?
Depending on the kind of cloud, water or sand
All of these companies use other hw vendors to build their custom products
Every major hardware vendor plays a part - hpe/dell, Arista/Cisco/juniper, mellanox/broadcom and lot more
Oci sells me Larry Elision
Computer equipment