At the end of the day, all of this depends on a manufacturer actually doing what they say they'll do in regards to the data that's available. Like it or not, the data is available from these devices. There is nothing technical available to stop data from being used. We have to put some level of trust in the manufacturers, vendors, and whoever else has access to the data. There are legal recourse options, but that takes time to work through the courts and with regulatory agencies.
As always, privacy is a "buyer beware" proposition. Consumers have to know what is being shared so they can make an informed decision about whether to participate and about whether the vendor can be trusted.