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> That's nice but it's not an ebook reader, but an e-ink screen for computers.

not by itself but it can connect with one usb-c cable to the phone for both power and data. 

(i guess you have not heard about mobile screens yet. those have been around since shortly after usb-c became normal.)

so when i just velcro my phone on the back i could make it into an ebook reader whenever i feel like it. my phone has a nice free open source operating system on it so it wouldn't bother me with updates or bloat.