The Oracle vs. Google case is based around the copying of header files, including comments, verbatim as is.
The Oracle Amazon API usage is an identical re-implementation of the interfaces, but as a web solution there is per se nothing to copy in verbatim form.
The IBM-PC copycats back in the 80s went as far as clean room re-implementing the system with engineers who never saw the documentation. Ripping the header files out of a proprietary license package is quite cheap from a legal standpoint in comparison, even if open source is provided.
The Oracle Amazon API usage is an identical re-implementation of the interfaces, but as a web solution there is per se nothing to copy in verbatim form.
The IBM-PC copycats back in the 80s went as far as clean room re-implementing the system with engineers who never saw the documentation. Ripping the header files out of a proprietary license package is quite cheap from a legal standpoint in comparison, even if open source is provided.