The Tor Mode in Brave really is too leaky to trust against a nation state attack. I was reading the open issues that can still be hammered on and they are right. If you're doing something that could get you in deep shit, use Tor Browser. One of the open issues is that the browser can be made to start Widevine in the Brave Tor Tabs. That's really bad. So Tor Tabs? Hide what you're doing from the library? Sure. From the NSA. Hahaha no. But it is good that a mainstream browser is moving in the direction of having a real private mode.