We already said this multiple times, and should also be common logic - the participant of the duel can bet on the duel, but only on himself.
First time I heard about that, so many rules and regulations and I cant keep up with everything

I doubt if this was for this season . You may have to recheck. This should be for last season cup rewards. Correct me if I'm wrong.
It was link from OP so I just copied it, maybe it needs to be updated there.
Shame I dropped out quickly, I see rewards are much higher than in previous season
