How does knowing what data Facebook has on you change anything? You already know the data they have by virtue of the fact that you give it to them. I just don’t get what damage this protects you from?
What about the data they have on people without accounts on their service, but who they track across sites and through friends? I can keep myself from having an account, but I can’t stop my family and friends, and I can only do my best to block their trackers. I’d like to know what shadow profiles they have on me, despite the fact that I gave them nothing.
To be clear before I answer, you’re acknowledging that this isn’t actually just about data willingly given, right?
What does it change? Not much just by knowing, but it can allow for change, including exercising a right to delete that data under GDPR. That is a positive change in my opinion.
Having data on someone doesn’t constitute any kind of damage. So I don’t understand how I benefit from this at all. If my data is hacked, I’m not compensated. If my data is misused, I’m not compensated. Nothing has really changed to protect me from actual damages resulting from personal data collection. But apparently lots of small businesses and startups are now hurt, and Facebook is in a stronger position to collect PII.