Hey there, great to see interest in innovative use cases for Bitcoin and blockchain technology! It's definitely possible to create a network where people own and sell their own generated data. There are already some projects out there exploring this idea and utilizing blockchain technology for secure storage and transfer of personal data such as Datum, Ocean Protocol, IOTA Data Marketplace.
Regarding data control by individuals, smart contracts executed on the Bitcoin Lightning Network could allow individuals to maintain full control over the use of their personal information while allowing them