All three reasons are directly specific to Brave Rewards. That's their business model that caught Peter Thiel's eye. Which you can opt-out of.

If you believe the actual browser is siphoning off information to Palantir, that's an entirely different story.

But for now, this post just reads like a conspiracy theory. The browser's FOSS. Surely switching.social is capable of checking the source code for anything fishy, and using that as their ammo instead.