ad 2: Brave takes a 30% cut of the add income. The adds you block are targeted adds, thus they yield a higher income. Besides that there are usually service fees for converting your BAT to other currencies.
The entire service is opt in making it also not guaranteed for the content creator to receive the reward.
This should lead even in the best case to a notably worse outcome.
The current case is content creators not receiving any reward because people are using ad-blockers. I don't see how that can possible be "best case" a "notably worse outcome". Worse case, content creators get some pittance where before they were getting nothing. Best case content creators can be entirely directly funded by the people actually consuming their content.
The entire service is opt in making it also not guaranteed for the content creator to receive the reward.
This should lead even in the best case to a notably worse outcome.
ad 3: https://outline.com/fJm5C3
ad 4: i explained the issue in my other response.