So instead this project/browser is directly making users be able to monetize their own data huh? I don't know why would someone keep their browsing habits and keep or collect any keystrokes they did in order to monetize it which is what this browser did according to their whitepaper. It really seems absurd to me. I think if someone rigorously protects their privacy, I believe they will try to minimize any data collection as much as they can to achieve that instead of using this kind of project/browser model.
Privacy depends site by site.
Also, this browser only collects data and you have the option to sell it in Ocean protocol. But of you refer privacy over earning some money then you can
do it with this browser. This is a really good one to make sure none of your data will go out of Decentr blockchain.
Also, aside from holding your own data in the blockchain inside your wallet and prefer on not selling it, there is other way for you to earn $DEC token and it is granted every end of month. That reward is based on the data you've collected whether you sell it or not as long as it is increasing you will receive the $DEC rewards.
Also, maybe you will say that Decentr will sell your data without your knowledge. thats the reason they are aiming for GDPR compliance to make sure no data will be collected and sell by them. You user, only you manage and handle your own data. sell it or not it's okay and it depends on your preferences.