Amazon isn’t nesessarily against censorship. They just don’t want to provide this sort of spoofing service. Regardless of whether the spoofers are good or bad.
I believe this is the fundamental issue, from Amazons PoV: this altruistic project with nice goals is abusing a network nuance, but most other actors using this capability are likely to be bad actors.
I don't think Amazons reasoning was "oh, lets help dictators dictate", but more "hey, isn't this a potential security hole ripe for abuse that would make us look incompetent?".
I don't think Amazons reasoning was "oh, lets help dictators dictate", but more "hey, isn't this a potential security hole ripe for abuse that would make us look incompetent?".