I said a lot on some of it at comments you can see, starting at Logged me out and got no credit for Ads for 2 mos - #10 by Saoiray
The TL:DR is they have had a lot of instances of fraud lately. Much time has been spent trying to prevent it and that’s also where they are taking longer at times to get back to people, as they are doing deeper looks into issues. And it’s not just issues with Brave, but Gemini and Uphold also have been having issues that have interfered.
Sometimes “innocent” people are being flagged by the system, essentially getting caught in the net they have thrown out to catch those who are doing wrong. But it always gets resolved if people message them with the information they need and then are patient.
I kind of addressed some of that at Old PSA, what to do if no payment yet