So with Brave rewards, users can make money (or BAT). Does this fact mean that sites make less money? (assuming the site gets no tips)
if it depend on ads that brave blocks then yes
Well the money for our BAT comes from campaings you see here: https://www.batadvertisers.com/
But sure as justsomeone1 mentioned already the shield blocks their own ads and therefor they a re not counted for them.