Take in account that the CEO of Brave also invented the Javascript code you are using to comment there, co-funded Mozilla.
He have expertise (and a lot) on the web! He knows what he is doing!
And remember that his Brave Search achieves very good search results and they accomplished that in very little time. Meanwhile, e g Mojeek still cant accomplish a Google level so it is not really an alternative (as brave search is). In my opinion, this was possible at least in a large portion because a Brendan knows what he is doing!
And, AFAIK, he has done his best to maintain a good separation between his personal ideas and his work (AFAIK)