If you make your technical decisions based on, as far as I can tell from Wikipedia, 1 minor political disagreement with the project lead then you'll be as limited as Stallman when it comes to using a computer. That is an extreme position.
What all this small resentful and passive aggressive people did against Brendan was the only real shame on this history.
I fail to see the relevance here.
Seems like he was forced out of Mozilla by a bunch of children who can't handle the fact that people have different opinions and perspectives. Even though I disagree with him on this particular issue, he was not the one acting wildly unprofessionally here. A brief look at his resume and the relative success of Brave as a company suggests he's perfectly qualified at his job.
To be clear, I'm not some Brave fanboy. I don't use Brave because it doesn't offer me anything I need that Firefox doesn't.
Brendan Eich's personal views have nothing to do with it.
[1]https://en.wikipedia.org/wiki/Brendan_Eich