A random person saying they'll assassinate the president probably won't be a serious threat, but if you have military clearance, access to secrets, show intent to trade those secrets, and initiate communications with foreign powers then that's more than enough to prosecute. Saying you were "just joking" to scam some money isn't much of a defense.
I believe that generally folks don’t do this type of thing often because the type of person that would pay you $50k in this situation might also be very prone to just murder you if they thought you were playing with them hah
Either way, no fun for anyone.
(A drug conspiracy requires no "act in furtherance.")
So if you are "just joking" with your team and one of them takes your joke seriously and purchases bank robbery supplies or puts an SD card into a sandwich you are liable.
I think the most solid proof thats its not a geuine conspiracy would be
A) if you lied to the person giving you the money, about owning a gun or something else relevant, showing your intentions weren't genuine
B) showing the conspiracy is not credible, i.e. you are conspiring ro use a sniper rifle but you don't k ow how to shoot.
Also conspiracy doesn't require you to be proficient at executing your plan but rather the intention and motivation and opportunity to do so. You can still shoot a gun and cause harm even if you don't know how to shoot, and there's no way to really prove you don't either.
Expressing a credible threat of violence is a crime in most countries, I believe.
'Credible' is a key word though, a random joe who doesn't own a gun is not credible to assasinate a President.
There is a specific law for exactly that, however, making threats against the president. And those threats do not actually have to be communicated to the president in order for them to be illegal.
That said, on the other hand, if someone wants repeat business they will do what you pay them for. It's why ransomware works - if a ransomware guy doesn't unlock things after being paid, nobody will pay ransomware guys.
TL;DR like most business, it's based on trust.
Anyway, anyone want to buy some secret documents? Just send me 50K worth of bitcoin, you can trust me.
If you wanted to sue me foe fraud, you would be admitting to hiring an assasin