Earlier quoted context omitted.
That's all fine, but there is zero evidence that any company is doing that. Furthermore, even if a company was using differential privacy to anonymize data between the collection and the processing step, there is no way to prove that the data is being handled appropriately before and during the collection step. Also, there is no way for a company to prove that they continue to handle data appropriately over time. The…
It is a new field, I admit, but it shows there's a false dichotomy between privacy and stopping all data collection and analysis. LeapYear Innovations [1] looks like they have some clients who care about differential privacy. [2] [1]: http://www.leapyearinnovations.com/ [2]: http://www.leapyearinnovations.com/shroudbase
You also didn't respond to this:
> Furthermore, even if a company was using differential privacy to anonymize data between the collection and the processing step, there is no way to prove that the data is being handled appropriately before and during the collection step. Also, there is no way for a company to prove that they continue to handle data appropriately over time.
Any company using shroudbase can choose to stop using shroudbase at any time, or accidentally introduce a bug into their collection method, or start also saving the data in MySQL at collection time.
Tools like that are useful to distribute data from trusted to non-trusted parties. You still have to trust the analytics and advertising companies doing the collection.