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I wouldn't really consider any of the apps you mentioned to be "popular". People who use anything other than the app provided by the ecosystem they bought the epub from are fringe at best. As are people who are reading epubs not purchased from large publishers.
That's not a value judgement on my part, just an opinion based on years of observation. People who care enough to read epubs they didn't purchase from major publishers on reading apps that don't come close to honoring the epub spec either: 1) don't care about the areas where the apps fail to render properly, or 2) already know how to edit the epubs they're reading to get them to render the way they want them to.
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