The maintainers of this extension are not responsible for the data sent using the chrometophone service.
This service is provided by Google and all traffic travels over their servers.
Acceptance of Google's T&C's are a implied by using this tool.
Non-http links are sent with the help of a proxy, you can change the url to whatever you want using about:config and setting extensions.sendtophone.proxyUrl. This proxy will be removed when http://code.google.com/p/chrometophone/issues/detail?id=86