You mean by building the add-on directly into the browser? No thanks. I like my browser dev to work on my browser and my ad-block dev to work on my ad-block. They are both good at what they do on their own, I don’t need them to mix.
Those features are opt-in.
They are now. They were opt-out to begin with. This is one of those “fool me twice” situations. That, and the founder of Brave is also an outspoken homophobe. He financially backed Prop 8 in California to overturn same-sex marriage, and left Firefox because it was too woke. I seriously would rather Chrome at that point. They’re just regular levels of corporate evil, not “every person who uses my browser is proving my identity politics” level of evil.