There was a big uproar when it came out, they would accept donations on behalf of creators even if those creators had never made any kind of contract with them. Not sure if they still do that but it's pretty sketchy behavior to take money on behalf of someone you've never talked to and probably doesn't want you taking money for them. Especially people that already have actual donation methods.

Don't encourage them.

Brave directly profits off of showing their users advertisements. I have no intention of supporting that monetization scheme, crypto or not. It's a direct downgrade from the privacy models of Ungoogled Chromium and Firefox.

The answer is nothing, because a browser without significant adoption is bound to have some inevitable issues. I've tried Orion, for instance, but the fact that 1Password is not signing extensions so that IPC works on these browsers (rightfully so, because it'd be easy to grab your entire vault) already makes it not worth considering. It also would likely need to be proprietary, because selling binaries doesn't really work too well if your product picks up steam. Which then conflicts with the privacy promise.

Ungoogled Chromium is probably your best bet.

The problem is tracking brings more money than what the average user is willing to pay. My persona is not relevant.

I think the solution is from regulations, like GDPR in Europe. It’s not popular to say that here, but at least you can think about it.