Providing data to third parties for processing is clearly different (and as an ex-user of one of Fitbit's products I definitely wouldn't have expected that this is the case -- Fitbit's fitness tracking is so core to the company that I wouldn't expect the processing of said data to be outsourced.) Yeah, it's in your privacy policy but that's just a cop-out (by that metric, no product can unexpectedly send data to third-parties).
Here's the whole paragraph:
We transfer information to our corporate affiliates, service providers, and other partners who process it for us, based on our instructions, and in compliance with this policy and any other appropriate confidentiality and security measures. These partners provide us with services globally, including for customer support, information technology, payments, sales, marketing, data analysis, research, and surveys.
Since the software is proprietary, and you are not making an official announcement on behalf of fitbit, why should we believe you? What you say directly contradicts the privacy policy[0] on your employer's website, which certainly states that they have the freedom to share your information 'with others': "You may also authorize us to share your information with others" and "We transfer information to our corporate affiliates, service providers, and other partners who process it for us"
0. https://www.fitbit.com/legal/privacy-policy#how-info-is-shar...