While investors always have the risk of trust me with their money, it's indeed possible to place a bet that poses no-risk to investors. For instance if you play that roulette game, and put a 1 bet on every number (including 0) its impossible for the investor to lose (or the player to win). Not really a common case for single-player games, but it's easy to imagine in a multiplayer bet (Bob wins 1.99x if it's heads, Matt wins 1.99x if it's tails) where they both bet the same amount.
Currently investors will make 50% of the house edge for that bet (even though they shouldered no risk, so it's effectively free money) but it's really such an edge case at the moment
thank you very much for explaining what a zero risk bet is. and yes I am really surprised that Nico and ndnhc didn't know this.
and regarding but it's really such an edge case at the moment our app had this zero risk bet a lot of times (bets on all 6 racers same time/bet) and even ndnhc (not the only one because it was smart to do this bet during this contest in the right moment) was doing this zero risk bets during a most wagered contest. and I promise you that in case of another most wagered contest there will be again many zero risk bets.
and if you look at the "before" graph that dooglus posted it was exactly like you also posted it
in case of a zero risk bet
MP should get 50%
and app owner get 50%
and this was fair enough because the Investor had no risk