What if I told you that playing a low-stakes game and real life are not the same thing?
How can you trust your judgement on whether they’re truthful about bigger things?
You can't. You will believe what you want to believe, and good liars are great at finding out what you want. A well constructed lie rests on verifiable foundations - ie. they also know when not to lie to earn your trust - and comprises of almost exclusively truths. There is no way to defend yourself once you become the target and start listening.
The only winning move is not to play.
(Even if like me you won't end up playing the game I found the experience worth five dollars)