For patient data, there are some exceptional laws in some countries. While I hope it does become EU law someday, we are not there yet. I have never heard of any laws that allow one to export data but then to give some guarantee that the data won't be sold. Source?
But for the general case (ie a normal business venture), people are already using services that will exploit/refine any personal data being sent there. Gmail is one, but Facebook is a better example. Facebook will use the data even if it about someone who aren't a Facebook user. Cloud services could be doing things, but I am not sure its true in practice yet. Mobile apps are already getting and selling data, and has a long history of doing exactly that.
Webshops that use paypal are sending their customer data to paypal. If one read their privacy policy, one can see that they use the data to: a) compare information and verify it with third parties. b) Send to companies that perform marketing and "other services" for paypal. c) Send aggregated statistical data to their business partners. d) send any data to eBay Inc. corporate family—like eBay, Skype or Shopping.com (https://cms.paypal.com/au/cgi-bin/marketingweb?cmd=_render-c...)