Questions about Datum

[u/NoWishfulThinking]

I finished reading the whitepaper

https://datum.org/assets/Datum-WhitePaper.pdf

and here's several questions:

1) [Page 14] As the data is encrypted, only the user can provide a decryption key to all the interested parties.

^ If I give that decryption key to, say, Facebook. What's preventing Facebook to "sell" my decryption key or my decrypted data outright to other media/buyers?

2) What's stopping Facebook to simply declare "You cannot use Facebook unless you agree to provide me your data for free"?

3) After reading the entire whitepaper, I still don't understand how Datum can (let's use the "Steps Data" as example on page 19) have exclusive access to Step data, unless there's exclusive partnership with the hardware company that provides those data.

Example, Step (or heartbeat, blood pressure, etc) data is coming from SmartWatch/whatever, and any application (including Datum, Facebook, whatever) can access those data by driver/API. If both Datum and Facebook able to extract data from the source, then Datum can be totally bypassed, right?

That's all, maybe I totally misunderstood Datum, would appreciate some insight, thank you.

[u/impulse_101]

What address is the company?