Check the URL. It doesn't look like it's stealing content, just reformatting it. Like Readability for Instructables.

It's excellent because people have contributed a lot of great content to instructables, but it's unreadable with instructable's current design. ("Log in to see more than one sentence!")

I work for a company that does content protection, and even I fully support this instructabliss... Instructables has become very cluttered and unusable.