It was pretty clear when you signed up that the Brave Rewards Token was subject to changes and not complete, I think it even referenced taking the currency out is a right the company reserves, I signed up over a year ago maybe this has changed.
The cryptowallets were just a quirky add on for fan boys because storing your keys on a browser isnt safe to begin with, especially without 2FA.
The encryption used by a few third party password managers is superior to google and apple but I am not sure how trustworthy the businesses are, or if they use bulletproof hosting.