It could be fun to implement this under *NIX for fun
cronjob to take screenshots, some OCR, throw it in a database...I'd never want to use this "feature" but as an academic exercise it could be a fun project.
But having it implemented by my OS, and not by me...yikes. No thanks.
There's a certain irony in bemoaning subscription news paywalls on an article about the alternative, unsavory monetization paradigm...