Have u been to any casino at Vegas or Macau? There are many tables where the winning rate is 1/10 and the payout is x2. They're licensed and get audited as well. No one dare to call them scam.

The reason I mention this is because there is nothing scammy in running a game with low winning rate. Gamblers do not gamble only because of the winning rate. There are many other factors that makes them decide where will they throw their money at.