From Amazon’s FAQ:
What about handling secure (https) connections?
We will establish a secure connection from the cloud to the site owner on your behalf for page requests of sites using SSL (e.g. https://siteaddress.com).
Amazon Silk will facilitate a direct connection between your device and that site. Any security provided by these particular sites to their users would still exist
This sounds a bit ambiguous. Are they or are they not acting as middle men? They might not be as it looks like they’re not using HTTP.
If this is true, I think there’s going to be a huge backlash against this. People simply won’t tolerate them being able to see your private traffic. What happens when a law enforcement agency asks for access? My money is on them changing this before they ship.