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The trouble is, even if you purchase and download from legit sites, you are not guaranteed to get an epub that passes epubCheck.
I purchased, from Kobo, and downloaded a straight epub of a Harper Collins book by Anne Hillerman. I did remove DRM for my own library, as I also read on a Kindle sometimes. And because I was puzzling over something in an ebook I was making, I decided to have a look at their code, so I exported the epub out of Calibre and opened it in Sigil. I ran epubCheck on it for fun and ugh, THREE ERRORS!
Seems sad that you can't get a validated epub for your money even out of a big publisher on a legit site in 2021! The good news I suppose is that the errors didn't prevent it from working on my Kobo, but still ... YEEESH!
And of course, I have also had the experience of purchasing a book trilogy on Amazon, that, when I got around to reading it a year later, long past the point of being able to return, turned out to be a horribly proofread pirated books, rather than the legit books I was expecting.
So though it's possible the OP obtained his book from a sketchy source, it's also possible he got a lemon from a legit source. They are out there. I still remember buying direct from an author's site in my early e-reading days and getting an epub on which the font size was tiny and could not be adjusted!
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