Brave's ad blocking and advertising are separate things - the adblocker is basically pretty much like uBO, but written in Rust and integrated as part of the browser.
Brave Rewards is a separate module that lets users watch ads that get delivered as toaster popups. Brave uses a part of the revenue to buy BAT from the open market and gives it to users who viewed the toaster popups. The company also operates a tipping service that lets users give those crypto tokens to content creators they like. (Since Brave buys the tokens, the tokens will have a buyer who pays with real money from the real, normal advertising business).
Second, the browser did actually start being built on top of Gecko - as far as I know they had an Electron-like solution just with Gecko, and used that for the first versions of the browser. Later they transitioned to being a Chromium soft fork.
Brave's ad blocking and advertising are separate things - the adblocker is basically pretty much like uBO, but written in Rust and integrated as part of the browser.
Brave Rewards is a separate module that lets users watch ads that get delivered as toaster popups. Brave uses a part of the revenue to buy BAT from the open market and gives it to users who viewed the toaster popups. The company also operates a tipping service that lets users give those crypto tokens to content creators they like. (Since Brave buys the tokens, the tokens will have a buyer who pays with real money from the real, normal advertising business).
Second, the browser did actually start being built on top of Gecko - as far as I know they had an Electron-like solution just with Gecko, and used that for the first versions of the browser. Later they transitioned to being a Chromium soft fork.