I honestly can’t imagine how the Hi-Lo game wouldn’t be generating revenue. It’s the equivalent of roulette — mathematically always profitable for the house. Any refer/interest system can always be adjusted or reduced.
Mathematically the multiply BTC game will indeed generate profit for them. But it completely depends on the wagering activity of the user, which has decreased significantly in recent months for all these issues. They had stopped the reward system instead of adjusting them. The delays in processing the withdrawals have made the thing worse for them. I doubt anyone still deposits at Freebitco to play the multiply BTC game or to place bet on other events.