Every Android or IOS device is spying on you. Although you can deactivate quite a few system apps on Android with adb. And if the OS isn't spying on you then some apps will do.
Since you asked for "a phone-sized ereader" and not explicitly for an e-ink device I can recommand TCL NXTPAPER phones. If you won't use it as a phone, the older TCL 40 NXTPAPER will do quite nicely. Koreader runs as app without problem and the matte screen is great. My e-ink devices have more reflections than the TCL-screen. The TCL 40 NXTPAPER is available at around 150 Euro e.g. on amazon.de right now.
You can switch the normal colour screen to a b/w screen (or a more paperlike colour screen) quite easily on the TCL 40 using the drop down menu and clicking on "NXTPAPER MODE".
Since the NXTPAPER screen is no e-ink screen it has no ghosting, no annoying refresh and colours look like one would expect them to look like (e.g. they are not washed out).
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