I also find the self-acclaimed "Brave" browser company an odd partner to work with for an organisation dedicated to the open web like IA. This browser has exactly one purpose: to make money. In terms of the people working on it, it's arguably more commercial than Chrome, Safari, or Edge.
The proposition "Brave" is making is: "Don't you also feel what this world needs is an intermediary between you and the people creating what you like, skimming from both sides whenever money is involved?"