There is always tons of venom of this exact sort thrown at Brave on HN, yet I've used Brave and have not seen any ads that have been spoken of. Even if they did replace, to be frank, the advertising industry already is disgusting and I'd have no problem with it (well at least no more problem than I already do)
In any case it's a great browser, at least better than Chrome when it comes to privacy, and I personally won't fall for the propaganda. Just like Tesla, there is a lot of "old" money that is threatened by the upstart so there is also a lot of negative sentiment.