It's going to have to be specific to a device/app, I'd think. They can't just make any-old ebook start collecting data willy nilly. Unless they're in cahoots with the firmware devs for device manufacturers, that javascript file is going to sit there like a lump in most cases. Kobo does some js, but I certainly don't think they do any old js. Epub3 allows js, but there's still going to be limitations on what it can do.
I rip open a lot of ebooks (including Penguin ones) from a lot of vendors and I've never come across this file. I'm guessing it's going to be found in something cloud-based or in the dedicated apps for ebook subscription programs.
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