公式ブログに

For ad-free mode, you pay a monthly fee in Bitcoin (BTC). [...]
For ad-replacement mode, once an ad campaign is reconciled
and our advertising partners pay us, the total views from
the ad-replacement users are aggregated into a weighted list for publishers.
From the total payment, our ad-matching partner takes a share (15%),
we take our share (15%), we reserve the user revenue share of the total payment (15%)
for ad-replacement users, and the remaining amount is allocated to the publishers (e.g., 55%).

ってあるけど、Braveが本来広告を打ってるサイトに入るべき広告収入からいくらかピンはねするって話？