I looked at the link you provided. I must say, as a dolt-level techie (74-year-old retired neurosurgical anesthesiologist) that the instructions appear VERY involved. I expected a simple on/off button but instead it's like something I'd find on HN....
First, it's opt in. So you'd only need to opt out if you'd opted in at some point.
The instructions boil down to: Click settings, uncheck Brave Rewards button.
The rest of the article tells how to disable new tab background ads, remove the rewards UI, and how to do it again on mobile...but these are more personal preference things.
Edit:
Just tested it by opting in. Easiest way for me was -
1 - Click settings
2 - Click Brave Rewards at top
3 - Click Manage Brave Rewards
4 - Click Reset
This actually removed all the checkboxes and such, and treats you as if you'd never opted in in the first place.
