Amazon makes Kindle firmware files available to anyone with an account. The tools needed to get at the files inside the firmware files is freely available on MR and elsewhere. if you've pulled the fonts out of the Kindle firmware and not downloaded them from some other site, then I don't consider it piracy. I'm not actually sure what it is as you can download the firmware without agreeing to any terms and conditions.
As for Bookerly, if you want the latest version for eInk, get it from the 5.7.2.1 firmware.
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