You can call it whatever you want, a service which this guy promotes is gambling, and I need to know my odds before I get into the game, and my odds directly depend on a fraction of my prize which service provider takes from me (aka a house edge).
So how would you do that with a sports betting website in a situation like this?

For instance, current value on Nitrogen Sports for Pittsburgh Steelers vs. Tennessee Titans:
Pittsburgh: 1.341
Tennessee: 3.553
Nitrogen don't say "we take 5% Commission on payouts" or anything like that... They factor in a spread on the various lines...
So I guess you'd work it out the same way with Binary Balls...
If the binary balls guy shows a table with the history of bets (including current ones), that will do. This is what crypto dudes claim all the time: we are better than traditional "blah-blah", because we are so transparent. Then be transparent, or remove your claims.