Use a Crypto browser and several websites helps you to immediately earn Bitcoins.
If you're referring to the Brave browser, then that's a waste of time. I haven't really tried it myself but from searching online, it appears that you can make ~5$ per month and that assuming you're very active.
As far as I know, the reward given by Brave Browser from its advertisements is not Bitcoin, but BAT using the Ethereum Blockchain.
Bitcoin uses a different Blockchain than Ethereum, and Brave browser does not have a feature for mining bitcoin. So it is not correct to say that using Brave browser can earn Bitcoin.
Brave Rewards goes beyond supporting your favorite content creators. Brave Ads are enabled by default in Brave Rewards, providing the ability to earn Basic Attention Tokens (BAT) every time you view an ad.