After arriving a while ago at the conclusion that the best option for reading comics/manga is a full-sized tablet instead of e-ink based devices, got an 8’ Samsung tablet for not much. It serves the purpose but even with Blokada in it blocking everything it can, and every “privacy” option tuned to as closed as possible, i suspect it’s still leaking TONS of data, and would like to root it if there’s good choices for it. Do we have at least decent choices for Android tablets now in 2025? I search for this and people focus on phones with little to no attention to tablets
AFAIK, GrapheneOS supports the Pixel Tablet, which is probably the only truly secure android tablet on the market.
If you’re willing to sacrifice some UX, there are some Linux tablets. A cheaper option could be a 2-in-1 chromebook that allows installing Linux.
Otherwise, you could try to degoogle your Samsung tablet by installing LineageOS on it, if it’s supported.
Graphene on a Pixel Tablet is great, and Orion Viewer on FDroid is a passable, albeit not ideal comic reader (it does tend to not do certain cbz’s at random for some reason tho)