AWS and GCP are giving companies like Apple huge discounts so someone could say something like, "Even Apple iCloud is in AWS and GCP because of how economical it is"

There is too much nuance to say one is better than the other. In some cases using a IaaS is more economical, in other cases it's not.

For Apple, the same is also true[0] to say "Even Apple is running their own datacenters because of how economical it is"

0 - https://dgtlinfra.com/apple-data-center-locations/#:~:text=a....