> If this wasn't protected, you would have zero incentive to build high quality libraries or to invest in making the platform popular if someone else can just come along and copy it.

I guess I must be hallucinating all those S3-compatible libraries and services.

> As the justices pointed out, it's a one-way interoperability.

It makes a large majority of the same code work on both. That's not one-way. Porting in either direction is vastly improved versus them making their own APIs.