Filesystem is either EXT4 or BTRFS, but the partitioning and redundancy from their SHR system is a combination of RAID1/5 and LVM.

It’ll probably run Android, so yes, but your eyes will bleed from the ghosting.

Did some searching, and all of Readmoo’s previous devices run Android. So you aren’t forced to buy any books from them. Install whatever reading app you want and get your books with whatever method you choose.

The rarity is the ability to do it without caring about the massive environmental damage often caused while procuring the minerals.