Earlier quoted context omitted.
From the article: "The company says its intentions in health are unconnected with its advertising business".
Exactly. There is so much money to be made from healthcare service, it is a market & revenue stream totally separate from advertising, and it can provide great value to many people. There are things one could be critical of regarding their acquisition of data, etc. but I don't think it is in Google's best interest to use the data for advertising.
No way in hell Google isn't going to use this for advertisement. It's exactly the kind of huge free money that drives everyone else to collect data totally unrelated to their core business. Even if the intentions are benign now, there's no reason to trust they'll be so later, based on Google's track record and the typical tech mindset.
Just imagine the kind of profiles you could build on people with medical data. Beyond targeted drug advertisement, medical devices, and the like, you know which people are sedentary, which play sports, who probably smokes, and I'd bet good money there are correlations between certain conditions and shopping habits, religious preference, and even political preferences. Just begging to be clustered with the latest hot neural net.