Brave is an ad company, in the sense that their only revenue is from ads.
Brave has every motivation to make external tracking as useless as possible, because it increases the relative competitiveness of their own ad platform. Since they own the browser, they can track as much as they want. I'm not saying that they do this today, their implementation might be very privacy focused right now.
I also appreciate that you need money to maintain a browser, even if it's just a layer on top of Chromium.
But we've seen again and again that maximizing revenue always wins out in the long term.
As long as primary revenue for Brave is ads I don't see why I should trust them any more than Google. Less so in fact, because Google doesn't depend on Chrome to generate revenue. For them it's just a helpful sidekick.