Brave rewards profile flagged?

Not necessarily. It advises not much you can do. One thing I will suggest for you and others is to check out the FAQ that’s pinned. I reformatted it last night so things are easier to find. Flagged accounts is one of them. You can see it at -Retired- PSA: User FAQ - Support & Answers

That may be the case, though keep in mind it can link your accounts to your payment ID and all, such as your Uphold or Gemini account. Often if you’ve been flagged, the big thing to do is to review what you’re doing that might have caused you to be flagged in the first place. Things like using VPN, Proxy Server, editing folders, cloning Brave, etc. Also if you think you sincerely think you did nothing wrong, you can always create a Support Ticket.

For all of those details, check out the FAQ I linked in my reply to ajcDev just slightly above where I quoted you here. It talks a bit more about a lot of things related to Brave, included why accounts can be flagged and what to do if you think your account was wrongly flagged.