I mean, the core thing they do has pissed people off: they're yet another attempt at an alternate monetization strategy for the web, but their approach do doing so is to basically forcibly insert themselves into the existing ways that websites and creators get paid, while not telling the users that the money they're collecting on their behalf might not actually be going to that site/creator (because the site isn't actually interested in having a business relationship with Brave, or they are but are still unable to get the money out)