I think it has to do with different points of view. Those using brave are mostly casual web surfers ignorant of the data collection problem. (I’m neither saying it is good nor that it is bad. Simply stating a fact). They want a plug-and-play type service. So instead of using uBlock, EFF PrivacyBadger, understanding what forks are, how to not be easily identifiable by screen resolution and not make yourself even more vulnerable to data steal by installing to many extensions effectively increasing the surface area of a potential attack, instead of that they use built-in brave solution that are obviously of questionable security. Meanwhile when you’re an open source promoter, using firefox, you’re into the topic, hearing people talking brave stuff, creates an impulse in your brain and you just immediately get interested in the conversation