The Guardian:

Apple has tightened its privacy rules relating to health apps ahead of next month’s product launch, which is expected to see the unveiling of an updated iPhone and could include new wearable technology.

The technology firm has told developers that their apps, which would use Apple’s “HealthKit” platform on the forthcoming products, must not sell any personal data they gather to advertisers. The move could stave off concerns users might have around privacy as Apple seeks to move into the health data business.

This is one of the ways and reasons why Apple has a leg up on other developers. While I wouldn’t trust them implicitly, I certainly trust them to take care of my data more than any other technology company.