If you choose non-e-ink displays, than the best longevity will be for GNU/Linux devices like Librem 11.
They likely won't support the Kindle app, however, and the users won't be able to access the books they paid for but don't really own thanks to DRM.
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They likely won't support the Kindle app, however, and the users won't be able to access the books they paid for but don't really own thanks to DRM.