>That’s very close to single-digit-percentage utilization - I understand why Amazon is avoiding re-negotiating that contract, it’s literally free money.

There's another reason for them to avoid this-- to not create the precedence that people can get out of contracts if they decide they don't like them anymore. If they let someone do this, even a big player like Twitter, that could lead to a lot of trouble in the future with other players trying to re-negotiate