He did donations against same-sex marriage. I see why some people would not want him to be an influential person, myself included.
Also because of how economy works now, interest in Brave translates to the value of its built-in cryptocurrency (BAT) and therefore the economic power of its creator.
For me hijacking its users' links and referrers to grab money [0] (while stripping this money from actual affiliate links its users may have followed) was enough. Software that does this is actually malware. That's actual loss of trust. I would not bet on it while waiting the next time they would get caught doing sth malicious.