The Brave ads cryptocurrency stuff was/is a turn-off for many. That'd be my guess regarding the downvotes, anyways. As well as the Brave redirection to affiliate links left a sour taste.
The money has to come from somewhere.
All other browsers have some kind of reasonable story behind the investment made into their existence (yes, even Chrome). Brave doesn't have any, and if the crypto ads stopped paying the bills, there must be something else that comes around to do so. Frankly, I wouldn't trust anyone who's put in that sort of situation with a piece of software I use to access anything important. Doubly so if crypto is a load-bearing component of the current status quo.