Ask HN: E-reader without vendor lock-in

I am looking for a simple e-reader device without any shop integration, user account, censoring, vendor lock-in. Just a device with SD Card and/or Wifi acceptable battery life good e-ink screen. It should handle common formats epub, pdf, html ...

I thought that would be easy but it seems to be only Kindles and Tolinos. Maybe the Pocketbook is the closest to what I am looking for.

What do you use? Thanks for any recommendations!