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Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by rofrol on Tuesday February 09, 2021 @06:10AM (#26076121)
I haven't tested it:

https://www.epubor.com/ultimate.html

eBook DRM Removal functions

Support eBooks purchased from: Amazon Kindle, Barnes & Noble Nook, Sony, Kobo, Google Play, Lulu, Smashwords, Fictionwise, and more... Input formats: KFX, EPUB, PDF, AZW, AZW1, AZW3, AZW4, Mobi, PRC, TPZ, Topaz, TXT, and HTML. Output formats: EPUB, Mobi, AZW3, TXT and PDF.

Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by criddell on Wednesday February 10, 2021 @12:28PM (#26092107)
That's basically a repackaging of the Apprentice Alf DRM tools.