Brave surely is a major browser with 100+M MAU, not too distant from Firefox with 150+M MAU.
Brave blocks those ads anyway so no point in Ublock, maybe that's why it's left out. It does inject it's own ads though, and then there's all the crypto nonsense.
Brave adblocking breaks some websites that uBlock Origin doesn't.
Lately I’ve had better luck with Brave than with FF and UBO, at least one my various banking sites.
Ads on Brave are opt-in (and not embedded on webpages anyway) and the "crypto nonsense" is a way for them to try to stay afloat without having to accept money from Google and the likes.
Let's hear it then because I'm using Brave and don't see the opt-out.
Have you ever actually used Brave? Because then you would have noticed the huge glowing opt-out billboard of a new tab page.
It's my primary browser since a few years. If you are talking about sponsored backgrounds, good luck finding any "major" browser that doesn't have something sponsored on it (opt-out).