Crediting amazon for "public cloud computing" is pretty ridiculous. Managed VPS services were a thing when Amazon was still a book store.
Yes, Amazon's services make things easier and in some instances cheaper. None of it was really inventive, though, and definitely not comparable to the list of Bell inventions.
This can't be a serious argument. Even today there's no cloud provider with the breadth of services that Amazon offers. Amazon didn't just implement cloud technologies like block storage, networking models, and off-board hardware support for virtualization; they created an entirely new programming model on those services.
I've heard the "it's not inventive" arguments like this from companies that tried to compete with Amazon. The one where I worked got creamed.
* public cloud computing -- Amazon got it to work in a scalable and secure way.
* S3 object storage
* Dynamo -- A distributed, key-value store that ended up in products from S3 to Cassandra
* Redshift -- First cloud SQL data warehouse with ground-breaking ease of use
* RDS -- Cloud relational databases
* Amazon Aurora -- Relational DBMS that pushes the log and store into a virtualized, replicated storage layer
They've been particularly innovative in applications related to data.