This article says they strip out the ads supplied with websites and substitute their own, which are presumably less dangerous. On the surface, this doesn't sound as good as running Firefox with crap-blocking security add-ons.
But one side effect of running Firefox with crap-blocking security add-ons is that the developers of many legitimate websites are incompetent and use a lot of crap which, if blocked, will cripple the web site. Does Brave solve this problem? I.e., does it manage to block the crap without crippling legitimate but poorly implemented websites?
I went to view the link to that article in IE, and it froze! When I viewed it in Brave, it worked just fine. Proof enough for me. How ironic!