It's a deal breaker because THAT'S NONE OF YOUR DAMN BUSINESS, and that also goes for Copyfish. It smells fishy to me, and _promises_ never kept prying eyes away secret documents. People who handle confidential documents should never use SaaS. It's an issue of trust, and Copyfish deserves none.
Okay, don't use it then. They make no claims of enhanced privacy and frankly it's unreasonable to presume a service such as this would do all processing locally unless you're paying a premium for that ability. Or did I miss the "Great for confidential documents!" banner? For most peoples' use-cases, this is not a concern.
There is simply no good OCR engine available that can run inside a Chrome or Firefox extension. The best available is Tesseract.js. And while this engine is fantastic as a project, its recognition rate does not come close to what is available server side.
Promotion - Yes.
Shameless - No. (This is what I think)
I am just curious. I sure love the idea of this extension. If I need to use something like this I atleast know a handy extension for this now.