The reason I disagree with your interpretation is due to the end of the sentence: “regarding any Service Offerings you have used”. The agreement currently has these definitions:

    “Service Offerings” means the Services (including associated APIs), the AWS Content, the AWS Marks, the AWS Site, and any other product or service provided by us under this Agreement. Service Offerings do not include Third Party Content.

    “Service” means each of the web services made available by us or our affiliates, including those web services described in the Service Terms.

I'm definitely not a fan of the broad wording which Amazon uses but I would find it hard to believe that any company large enough to consider bringing a legitimate IP suit against Amazon would have trouble finding a lawyer who can come up with an argument that e.g. the open-source project which they're suing over is not part of the web services Amazon's agreement covers but rather just a component which Amazon chose, along with many other people, to use to build that service.