Yes, it would take 10s of billions of dollars to recreate the infrastructure as far as servers and AWS has its own pipelines running under the oceans.

Then you have to recreate all of the services on top of the AWS.

Then you have to deal with regulations and certifications.

Then you have to convince decision makers to go against their own interests. “No one ever got fired for Amazon”.

Then you have to convince corporations to spend money to migrate.