While he states "We must reject e-books until they respect our freedom." He also outlines 7 things amazon's e-books do that violate this freedom. Fortunately epub is the most widely accepted e-book format and it has none of these 7.

1. Available anonymously.
2. Standard ownership applies.
3. License determined by vendor, but many have very liberal licenses including CC and public domain.
4. Open format based on html.
5. Lending rules same as physical book.
6. No inherent DRM (though Adobe has a version compatible with DRM).
7. No one can remotely delete it any more than any other file on your computer.

RMS isn't against e-books. He's against amazon's approach to e-books.