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 by not sellingthe data you've collected. 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.
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Well, I prefer to use a browser that does not collect any data even if it is locally. After all, since you maybe have some familiarity with it, what kind of data that the DecId store? it seems vague enough noting in the whitepaper it stated it will collect all of the online user activity and any keystrokes that the user make, so does personal id kind of things.
Also, correct me if I'm wrong, the user data is claimed to be 100% decentralized. But if I look Ceberus("Cerberus is a Decentr oracle. Cerberus stores and validates PDV (private data value)."), the data is stored on AWS, isn't it? Well, where is the decentralization?