1. https://securityboulevard.com/2019/02/brave-browser-sacrific... Brave has a whitelist for some facebook urls for loading scripts from third party domains. Found the brave community thread imaged in the post: https://community.brave.com/t/how-to-disable-facebook-twitte... My read of this thread is not having the whitelist breaks authentication using facebook and they offer an extension to remove the whitelist.
2. https://www.computerworld.com/article/3284076/brave-browser-... This is about the opt-in basic attention token system, where users can replace ads served by websites with ones that reward them with cryptocurrency. I have used brave for a while and don't use this system (using the built in ad block instead). I don't see this as a negative.
3. https://community.brave.com/t/does-brave-inject-buttons-onto... This is about some piece of the basic attention token system that apparently injects tip buttons into websites. I don't use the basic attention token system so this does not impact me.
4. https://twitter.com/vj_chidambaram/status/107647481470831001... This is apparently about the basic attention token system donation feature not sending out donations that do not meet a threshold. Again, I do not use this system. But I saw this mentioned by someone else in one of the comments on this post and the response mentioned Brave has changed their policies to refund people within 90 days if the donation is not claimed.