I think you're making assumptions about the kind of information that's shared. The kind of example to think of is when you buy from Fitbit and your information

I think you're making assumptions about the kind of information that's shared. The kind of example to think of is when you buy from Fitbit and your information gets sent to a payment processor. 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.