A few months ago I stopped wearing my FitBit as it was causing wrist pain. With the news that Google is buying the company I am relieved that I am no longer sharing the data.
Google isn't buying the company for technology, staff, or other reasons they are buying it for the data. Another example of how we are paying companies for the privilege to be their product.
While there are a lot of great tools and conveniences out there it is important to consider the privacy tradeoff in deciding to use them.