Although you'd imagine screenshots would be easy to OCR reliably, it's not guaranteed to get everything correct.

It's not like you can rely on a dictionary to confirm you've correctly OCRed a post by "@4EyedJediO" - who knows if that's an O or a 0 at the end?

And if you're OCRing the title and view count of a youtube video, for example, you've got to take the page layout into account because there's a recommendations sidebar full of other titles with different view counts.