e2ee is a technical term, not a social term. It only means that 2 devices exchange bytes and no third-party can read them. Nowhere is there any obligation that

e2ee is a technical term, not a social term. It only means that 2 devices exchange bytes and no third-party can read them. Nowhere is there any obligation that the 2 devices belong to different people: it is perfectly possible to exchange history between your laptop and your smartphone with e2ee.