but one thing I think could be fun for pvp gambling would be large series of rock-paper-scissors against a single opponent. The only non-exploitable strategy in rock-paper-scissors is by playing purely randomly, but that is guaranteed to have no expected profit for either player. (So if someone is being lame and playing randomly, you could detect that and stop playing with them after a while). I think it could potentially be a fun pvp game, where the complexity is such it's be accessible both people and bots.   (Although really hard to know without having built such a thing to try it out)