I see they say "if a domain or page is not crawlable by any search engine (it has a noindex tag), or if it is not crawlable by googlebot, then Brave Search’s bot will not crawl it either."
https://stackdiary.com/brave-selling-copyrighted-data-for-ai...
Loosely related XKCD: https://xkcd.com/927/
Then you need to gate your content such that it is not available openly to the public.
This falls inline with many objections to Google's WEI. If you host content openly and allow access freely, then don't be surprised when people access it at will and use it for free.
What possible justification could Brave have for this policy?