I've made an app that collect heart rate data from the apple watch and posts it to a public server together with an approximate location. Data is anonymized.
Apple rejected the app, since it relates to human subject research and need IRB approval.
The app and backend are open source. If anyone want to push this through their university and do some research, you have my full support.
-- rejection
Hello Peter,
Thanks for your time on the phone today.
As we discussed, we noticed that your app is conducting health-related human subject research however the seller and company names associated with your app are not from a recognized institution and we were unable to verify independent ethics review board approval.
We have now rejected your app for the App Store Review Guidelines detailed below.
Guideline 5.1.3 - Legal - Privacy - Health and Health Research
Your app is conducting health-related human subject research, but we were unable to verify independent ethics review board approval.
Next Steps
Apps conducting health-related human subject research must secure approval from an independent ethics review board. You can attach proof in the App Review Notes section of App Store Connect.
Guideline 5.1.1 - Legal - Privacy - Data Collection and Storage
We found in our review that your app provides services in a highly-regulated industry and requires sensitive user information, however the seller and company names associated with your app are not from a recognized institution.
Per section 5.1.1 (ix) of the App Store Review Guidelines, apps that provide services or collect sensitive user information in highly-regulated fields should be submitted by a legal entity that provides these services, and not by an individual developer.