It just says that the feature has been disabled by admins. Presumably due to a huge influx of users. I was just hoping someone knew of an instance that was in a better position to migrate to.

Mine definitely does. Micro SD.

https://shop.boox.com/products/go6

In theory the boox only has wifi. Presumably you could never connect it to anything, even by usb, if you loaded your books onto an sd card.

I recently got a Boox Go 6. It’s just a really simple android tablet with a paper type display. So whatever android reading app you use you could probably run it. Strictly in terms of privacy I’m not sure if it’s uniquely well suited. But I would expect it’s better than Kindle or Kobo.