"you grant Amazon a nonexclusive, royalty-free, perpetual, irrevocable,
and fully sublicensable right to use, reproduce, modify, adapt, publish,
translate, create derivative works from, distribute, and display such
content throughout the world in any media."
should compare this to what other services do, but at first sight it
seems ok to me. it's good that it's nonexclusive, and in the next
sentence they say they may use your display name in connection to it, so
it seems they are really just saying they may reproduce the reviews you
not sure if this royalty-free license would allow them to sell any
information you submit into your account to third parties, it seems to
be mostly about reviews.