Facebook can because they do emotions analysis. But there’s a ruling against them selling against that data.
But, once they have the baseline, they can likely find other data points that quite accurately map, that aren't covered in the ruling.
Amazon are great at screwing us while helping us - it is all so convenient, what could go wrong??
The problem is that even the tech savvy and security conscious can't keep track and at every point, there is a hundred new points created.
Yup, and that's why it is so important that we keep raising awareness. So people will support regulatory efforts like the GDPR and California's new online privacy law. Rather than approve one of Trump's first acts which was to give ISPs more access to commercial use of customer data.
Having too many regulations sucks but well-crafted ones can almost nullify the potential harm.
"Use that data internally as much as you want, but you can't share it. And you can only use your own platform data"
It doesn't matter how many new data points are created then. Shareholders aren't going to keep agreeing with multiple $5bn (and higher) fines every year. That will eventually lead to changes in the board room and on executive level.
Of course, then the battlefield becomes what consists of own platform data. Amazon owns RING so that's platform data. Facebook WiFi requires location access to be set to always ON, so that's own platform data even if it's the pages/businesses who use FB who provide the WiFi.
The more people understand the potential of data harvesting and profiling, the closer we come to potential solid regulations. Only those can eventually protect us and your data is worth that protection. It truly is.