I wonder to which extent tracking data is really anonymized since users can still request to delete it, as described in the privacy policy [1].

> If you choose to delete your account, please note that while most of your information will be deleted within 30 days, it may take up to 90 days to delete all of your information, like the data recorded by your Fitbit device and other data stored in our backup systems. This is due to the size and complexity of the systems we use to store data.

[1] https://www.fitbit.com/legal/privacy-policy#your-rights-to-a...