#2 Brave Ads are opt-in. You can alternatively fund the sites you visit on the web by putting BAT into your wallet directly and having the browser automatically distribute funds based on which content you spend time on per month. The entire idea of Brave is that people were already using ad-blockers, so I'm not sure how this is worse for content creators.
#4 BAT is an ERC-20 token - it exists on the Ethereum blockchain. Not sure why you think BTC would be better than that. Honestly not sure why you think Paypal would be better than that. At this point, anyone can transact the currency easily and quickly without any intervention from Brave. I can convert BAT to DAI right now on a decentralized exchange in less than a minute and have a virtual currency pegged to USD even if I don't bank with USD. At the moment this process is somewhat technical, but it overall seems very pro-consumer to me.
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.