the 20% that will not be in the lottery Jackpot is 100% for Crypto-games and not for the Investors or?
The 20% that are not paid out to the first place of a lottery round are mainly going to the second and third place.
To be exact, 14% of the pool go to the second and 4.5% to the third winner.
This leaves a 1.5% for the house, which is not shared with investors, as the game doesn't need any bankroll (and hence also no investors funds) to run.
Investors stake the bankroll for dice, slot, roulette, blackjack and our upcoming game, and share profits (or loses) from those games.