Brave taking cryptocurrency donations “for me” without my consent

I'd been really loving Brave and using it as my daily driver for a few months now, until that I noticed that little "Brave Ads" icon at the end of the address bar. That's when I realized their entire business model is just in the usurpation of existing Google ad revenue, dressed up with "privacy concerns" for the good PR. This sent me on a journey to find a really solid, free, Chromium based browser that is totally de-Googled, which seems absolutely impossible. I've tacitly settled on Vivaldi, but it's just impossible to really know if they are trustworthy as a company in the long run. Ultimately I feel like I can only trust a browser who's entire build process is open source at this point.

Honest question. Why not Firefox? What are your concerns with it?

Firefox runs worse than chrome still, and it doesn't work well at all on my 2 core 2015 macbook pro. It works fine on my 6 core & 4 core machines although.

I would also like something like the easy user switching that chrome has, since once user would have one set of session tab logins (twitter, fb, google, etc), and another user would have another. firefox -no-remote isn't that smooth of an experience compared to chrome's user switcher.