Brave blocks many type ads, 3rd party ads, pop-up ads, overlaid ads, plus but they do not block commercial ads for copyrighted, paywalled content. Maybe this has changed. You could tag Brave support and ask for clarification.
Posting a link that may help differentiate between the types of ads Brave does and doesn’t block. Again, maybe this has changed. I am not aware of any changes but I haven’t been as active recently as in the past.