On: Kindle collects a surprisingly large amount of data

[torgian]

I’m not surprised, but I suggest the Kobo e-reader to the OP. Can use multiple formats, easy to upload books to it, and some models have expandable memory. You can completely disconnect it from the internet if you want.

[dade_ → torgian]

There is also alternative open source firmware available for Kobo devices: https://github.com/koreader/koreader