homepage error: link for "Not a member of a current Prime provider?" is <a href="http://stayinyourprime.com/%10#providers" rel="nofollow">http://stayinyourprime.com/%10#providers</a><p>Also, higher-level: how should potential customers check if their provider is already on Prime?<p>Finally, my first question when I see a service that will help me with sensitive, private data <i>for free</i> is: who is paying for this? Maybe the providers are paying; maybe the plan is to sell "non-personally-identifiable" data; maybe there will be ads and/or targeted 3rd party offers; but if the site is secretive about its business model, I assume the worst. In this case the privacy policy seems to suggest the latter two options, which are bad enough for email hosting, but really quite dangerous for medical data. The process of pseudonymizing medical data is difficult and necessarily imperfect; so the consumers of any pseudonymized data need to be responsible parties.