As seen in the demo URL, the Canonical severs are anonymizing directly the URL with the probable behavior: typing a word in the Dash, pushes the word against (along with the locally-installed scopes) the Canonical servers, the Canonical servers decide the best results, the results are then anonymized and finally landed in the Dash.
This isn’t enough. Anonymity means that no one, not Amazon, not Canonical, receives your personal information. Canonical simply becomes the focal point of attention when “they” come knocking. http://iloveubuntu.net/smart-scopes-anonymize-images-landing-users-dash-privacy-oriented