Because that is not obvious and your post looked like uncharitable interpretation of uncertain things.

Are there others than Tom Scott claiming this?

Are there underhanded motivations propable on Tom Scott's side against BraveBrowser or the other way around?

My motivation? Wanting a browser that is actually pro-user.

If BraveBrowser (wont ever use brave as adjective there) used their platform to do underhanded tactics against people that didn't attack first than this would be interesting and a reason to toss any thought about using it. I don't see a trend there yet. More sources? I crave.

I'd love if Mozilla got their shit together but I am not seeing it coming.