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Philips Hue will force users to upload their data to Hue cloud
(www.home-assistant.io)
This is a most excellent place for technology news and articles.
For example you can be targeted with food ads when you're likely in the kitchen.
It builds a profile of you, and then they combine that with thousands of other profiles to build demographic profiles and then they sell this data to other firms or use it to further tune their own advertising services.
The same as pretty much every other company on the Internet. If it didn't work they wouldn't do it. Some people not understanding this due to over simplified examples makes no difference to that.
That's not necessarily true, people do things that don't work all the time, sometimes for a long time. There have been millions if not billions of dollars dumped into shit that doesn't work. Using charts to predict the stock market doesn't work, yet you can find people still doing it to this day.