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Educate them to install epub apps for iOs, Android, Mac, Windows.
Educate them how to download epub to whatever they have.
PDF are to PROOF documents for printing on paper, and then print on paper. It's the worst format for ebooks.
Or to really read online, create HTML for a website.
You don't read PDFs online, EVER anyway, that's an illusion created by a Browser feature that should be turned off. You download PDFs and read offline.
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