Steps+ collects your step count, and this information is ONLY stored locally on the device.
Information that is stored into HealthKit is managed fully (privacy, retention, etc) by the HealthKit system.
Do third parties see and/or have access to information obtained by Steps+?
The information stored on your device (what time and how long you worked out), is not accessible by any third party.
What are my opt-out options?
You can delete the application.
Data Retention Policy, Managing Your Information
The steps recorded , collected by 7 Minute Workouts, can be erased by deleting the app.
If a change of ownership, to a third party, of Steps+ or any of it's assets occurs, you acknowledge that the third party can continue to collect data as outlined in this document.
It is not warranted that the information provided is to be accurate, up to date, complete, or remain available. To the maximum extent permitted by applicable law, we exclude all representations, warranties and conditions relating to this software and the use of this software (including, without limitation, any warranties implied by law in respect of satisfactory quality, fitness for purpose and/or the use of reasonable care and skill).