That was just a concept, it never made it to a live build AFAIK.

What they should have done instead is just take hundreds of millions of dollars from Google, like a non-sketchy browser.

Don't forget when they took donations on behalf of other websites and kept the money unless the operator went to the "escrow account" to collect it

Already shared, but that (what you linked to) was a proposal and no deliverable was ever publicly released. A simple prototype was made and tested by a limited number of employees - instead of showing an ad, it would show a picture of a mustachioed man as a placeholder. That silly picture would be replaced with real code if the idea panned out. It didn't. The idea and the code was canned before I joined Brave and I've been here for almost 10 years (I joined August 2016).

Disclaimer in case it's not obvious: I am a Brave employee