Apple, Steam, Google et al. charge 30% on *digital* goods. With Amazon you get <50% for physical goods. If anything that's impressive.
AAA software is wildly expensive, but each incremental copy sold is not wildly expensive.
With a tea kettle, each incremental copy still costs you metal, heating elements and plugs, so the unit margins are smaller.
I'm conflicted about this statement. On one hand, it's almost passive revenue for the seller. On the other hand, Amazon offloads the risk of carrying inventory and takes half the revenue.
I'd argue that it's impressive with one caveat: the "partnership" heavily favors the house.
(Seller Fulfilled Prime is a thing, but in reality is currently closed for sign-up and is really only for the large sellers)