2. Number one for Android for me would be Pocketbook. It properly does all the CSS/HTL and does not spy. Supports OPDS/WiFi to Calibre Content Server and PDFs (on suitable screens). The only use for Google Books is Google free titles that can't download. Bluefire, Aldiko and Lithium work on older Androids.
5. I don't read ebooks on Linux, only check links. TOC etc. Calibre or Okular (though the default settings need changed).
3. I used Windows seriously 1993 - 2016. Best solution is Calibre, or change to Linux (free) or Mac (new laptop).
I only use desktop/laptop for huge PDFs or checking epubs, so I'd never use Thorium as too much works on it that doesn't work on most dedicated ereaders (I have Sony, Kindles, Kobos etc) or apps. Most people read on a phone, so I check on small screens inc an ancient Android 5 that is 4.3" as well as big tablet screens (Pocketbook on Nxtpaper 11 and Nxtpaper 14).
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